1011513531 has 8 divisors (see below), whose sum is σ = 1541353984. Its totient is φ = 578007720.

The previous prime is 1011513493. The next prime is 1011513541. The reversal of 1011513531 is 1353151101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1011513531 - 2⁷ = 1011513403 is a prime.

It is a super-2 number, since 2×1011513531² = 2046319246792175922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 48167311 = 1011513531 / (1 + 0 + 1 + 1 + 5 + 1 + 3 + 5 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011513498 and 1011513507.

It is not an unprimeable number, because it can be changed into a prime (1011513541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24083635 + ... + 24083676.

It is an arithmetic number, because the mean of its divisors is an integer number (192669248).

Almost surely, 2^1011513531 is an apocalyptic number.

1011513531 is a deficient number, since it is larger than the sum of its proper divisors (529840453).

1011513531 is an equidigital number, since it uses as much as digits as its factorization.

1011513531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48167321.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 1011513531 is about 31804.3005110944. The cubic root of 1011513531 is about 1003.8232081185.

Adding to 1011513531 its reverse (1353151101), we get a palindrome (2364664632).

The spelling of 1011513531 in words is "one billion, eleven million, five hundred thirteen thousand, five hundred thirty-one".