13397531 has 12 divisors (see below), whose sum is σ = 15786720. Its totient is φ = 11334960.

The previous prime is 13397509. The next prime is 13397533. The reversal of 13397531 is 13579331.

It is a de Polignac number, because none of the positive numbers 2^k-13397531 is a prime.

It is a super-2 number, since 2×13397531² = 358987673791922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13397533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2141 + ... + 5601.

It is an arithmetic number, because the mean of its divisors is an integer number (1315560).

Almost surely, 2^13397531 is an apocalyptic number.

13397531 is a deficient number, since it is larger than the sum of its proper divisors (2389189).

13397531 is an equidigital number, since it uses as much as digits as its factorization.

13397531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3554 (or 3547 counting only the distinct ones).

The product of its digits is 8505, while the sum is 32.

The square root of 13397531 is about 3660.2637883082. The cubic root of 13397531 is about 237.5061848805.

The spelling of 13397531 in words is "thirteen million, three hundred ninety-seven thousand, five hundred thirty-one".