1313531 has 4 divisors (see below), whose sum is σ = 1316832. Its totient is φ = 1310232.

The previous prime is 1313467. The next prime is 1313567. The reversal of 1313531 is 1353131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1353131 = 13 ⋅104087.

It is a cyclic number.

It is not a de Polignac number, because 1313531 - 2⁶ = 1313467 is a prime.

It is a super-3 number, since 3×1313531³ = 6798956071233300873, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1313731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 956 + ... + 1881.

It is an arithmetic number, because the mean of its divisors is an integer number (329208).

2^1313531 is an apocalyptic number.

1313531 is a deficient number, since it is larger than the sum of its proper divisors (3301).

1313531 is an equidigital number, since it uses as much as digits as its factorization.

1313531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300.

The product of its digits is 135, while the sum is 17.

The square root of 1313531 is about 1146.0938006987. The cubic root of 1313531 is about 109.5166394652.

Adding to 1313531 its reverse (1353131), we get a palindrome (2666662).

The spelling of 1313531 in words is "one million, three hundred thirteen thousand, five hundred thirty-one".