31896081 has 24 divisors (see below), whose sum is σ = 52869440. Its totient is φ = 18151776.

The previous prime is 31896071. The next prime is 31896083. The reversal of 31896081 is 18069813.

It is not a de Polignac number, because 31896081 - 2⁹ = 31895569 is a prime.

It is a super-2 number, since 2×31896081² = 2034719966317122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31896083) 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, 16935 + ... + 18723.

Almost surely, 2^31896081 is an apocalyptic number.

It is an amenable number.

31896081 is a deficient number, since it is larger than the sum of its proper divisors (20973359).

31896081 is a wasteful number, since it uses less digits than its factorization.

31896081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085 (or 2082 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 31896081 is about 5647.6615514742. The cubic root of 31896081 is about 317.1361686822.

The spelling of 31896081 in words is "thirty-one million, eight hundred ninety-six thousand, eighty-one".