31797521 has 12 divisors (see below), whose sum is σ = 37778688. Its totient is φ = 26673192.

The previous prime is 31797517. The next prime is 31797529. The reversal of 31797521 is 12579713.

It is a happy number.

It is not a de Polignac number, because 31797521 - 2² = 31797517 is a prime.

It is a super-2 number, since 2×31797521² = 2022164683490882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31797529) 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 11 ways as a sum of consecutive naturals, for example, 4601 + ... + 9206.

It is an arithmetic number, because the mean of its divisors is an integer number (3148224).

Almost surely, 2^31797521 is an apocalyptic number.

It is an amenable number.

31797521 is a deficient number, since it is larger than the sum of its proper divisors (5981167).

31797521 is a wasteful number, since it uses less digits than its factorization.

31797521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13868 (or 13861 counting only the distinct ones).

The product of its digits is 13230, while the sum is 35.

The square root of 31797521 is about 5638.9290649910. The cubic root of 31797521 is about 316.8091777145.

The spelling of 31797521 in words is "thirty-one million, seven hundred ninety-seven thousand, five hundred twenty-one".