1040631521 has 8 divisors (see below), whose sum is σ = 1072184040. Its totient is φ = 1009520512.

The previous prime is 1040631509. The next prime is 1040631541. The reversal of 1040631521 is 1251360401.

1040631521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 113124496 + 927507025 = 10636^2 + 30455^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1040631521 - 2²⁶ = 973522657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1040631541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105590 + ... + 115023.

It is an arithmetic number, because the mean of its divisors is an integer number (134023005).

Almost surely, 2^1040631521 is an apocalyptic number.

It is an amenable number.

1040631521 is a deficient number, since it is larger than the sum of its proper divisors (31552519).

1040631521 is an equidigital number, since it uses as much as digits as its factorization.

1040631521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220755.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1040631521 is about 32258.8208246985. The cubic root of 1040631521 is about 1013.3644365044.

Adding to 1040631521 its reverse (1251360401), we get a palindrome (2291991922).

The spelling of 1040631521 in words is "one billion, forty million, six hundred thirty-one thousand, five hundred twenty-one".