31000018 has 32 divisors (see below), whose sum is σ = 55520640. Its totient is φ = 12704640.

The previous prime is 31000003. The next prime is 31000063. The reversal of 31000018 is 81000013.

It is a super-2 number, since 2×31000018² = 1922002232000648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30999971 and 31000007.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29913 + ... + 30931.

It is an arithmetic number, because the mean of its divisors is an integer number (1735020).

Almost surely, 2^31000018 is an apocalyptic number.

31000018 is a deficient number, since it is larger than the sum of its proper divisors (24520622).

31000018 is a wasteful number, since it uses less digits than its factorization.

31000018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 31000018 is about 5567.7659792775. The cubic root of 31000018 is about 314.1381260400.

The spelling of 31000018 in words is "thirty-one million, eighteen", and thus it is an aban number and an uban number.