31497939 has 12 divisors (see below), whose sum is σ = 49633272. Its totient is φ = 19089600.

The previous prime is 31497931. The next prime is 31497941. The reversal of 31497939 is 93979413.

It is not a de Polignac number, because 31497939 - 2³ = 31497931 is a prime.

It is a super-2 number, since 2×31497939² = 1984240322495442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31497894 and 31497903.

It is not an unprimeable number, because it can be changed into a prime (31497931) 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, 158982 + ... + 159179.

It is an arithmetic number, because the mean of its divisors is an integer number (4136106).

Almost surely, 2^31497939 is an apocalyptic number.

31497939 is a deficient number, since it is larger than the sum of its proper divisors (18135333).

31497939 is a wasteful number, since it uses less digits than its factorization.

31497939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318178 (or 318175 counting only the distinct ones).

The product of its digits is 183708, while the sum is 45.

The square root of 31497939 is about 5612.3024686843. The cubic root of 31497939 is about 315.8110918928.

The spelling of 31497939 in words is "thirty-one million, four hundred ninety-seven thousand, nine hundred thirty-nine".