31168431 has 12 divisors (see below), whose sum is σ = 51452752. Its totient is φ = 17810496.

The previous prime is 31168373. The next prime is 31168433. The reversal of 31168431 is 13486113.

It is not a de Polignac number, because 31168431 - 2²² = 26974127 is a prime.

It is a super-2 number, since 2×31168431² = 1942942182003522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31168395 and 31168404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31168433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 247306 + ... + 247431.

Almost surely, 2^31168431 is an apocalyptic number.

31168431 is a deficient number, since it is larger than the sum of its proper divisors (20284321).

31168431 is a wasteful number, since it uses less digits than its factorization.

31168431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494750 (or 494747 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 31168431 is about 5582.8694235133. The cubic root of 31168431 is about 314.7059690138.

The spelling of 31168431 in words is "thirty-one million, one hundred sixty-eight thousand, four hundred thirty-one".