13087431 has 24 divisors (see below), whose sum is σ = 21708960. Its totient is φ = 7442496.

The previous prime is 13087429. The next prime is 13087441. The reversal of 13087431 is 13478031.

It is not a de Polignac number, because 13087431 - 2¹ = 13087429 is a prime.

It is a super-2 number, since 2×13087431² = 342561700359522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13087395 and 13087404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13087411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18105 + ... + 18813.

It is an arithmetic number, because the mean of its divisors is an integer number (904540).

Almost surely, 2^13087431 is an apocalyptic number.

13087431 is a deficient number, since it is larger than the sum of its proper divisors (8621529).

13087431 is a wasteful number, since it uses less digits than its factorization.

13087431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015 (or 1012 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 13087431 is about 3617.6554562313. The cubic root of 13087431 is about 235.6594184771.

The spelling of 13087431 in words is "thirteen million, eighty-seven thousand, four hundred thirty-one".