31868081 has 24 divisors (see below), whose sum is σ = 39907296. Its totient is φ = 25280640.

The previous prime is 31868051. The next prime is 31868101. The reversal of 31868081 is 18086813.

It is a happy number.

It is not a de Polignac number, because 31868081 - 2¹⁴ = 31851697 is a prime.

It is a super-2 number, since 2×31868081² = 2031149173245122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31868051) 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, 55526 + ... + 56096.

It is an arithmetic number, because the mean of its divisors is an integer number (1662804).

Almost surely, 2^31868081 is an apocalyptic number.

It is an amenable number.

31868081 is a deficient number, since it is larger than the sum of its proper divisors (8039215).

31868081 is a wasteful number, since it uses less digits than its factorization.

31868081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 31868081 is about 5645.1821051229. The cubic root of 31868081 is about 317.0433421019.

The spelling of 31868081 in words is "thirty-one million, eight hundred sixty-eight thousand, eighty-one".