31900345 has 16 divisors (see below), whose sum is σ = 38984400. Its totient is φ = 25056000.

The previous prime is 31900339. The next prime is 31900369. The reversal of 31900345 is 54300913.

It can be written as a sum of positive squares in 8 ways, for example, as 441 + 31899904 = 21^2 + 5648^2 .

It is not a de Polignac number, because 31900345 - 2⁷ = 31900217 is a prime.

It is a super-2 number, since 2×31900345² = 2035264022238050, which contains 22 as substring.

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, 91231 + ... + 91579.

It is an arithmetic number, because the mean of its divisors is an integer number (2436525).

Almost surely, 2^31900345 is an apocalyptic number.

It is an amenable number.

31900345 is a deficient number, since it is larger than the sum of its proper divisors (7084055).

31900345 is a wasteful number, since it uses less digits than its factorization.

31900345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 31900345 is about 5648.0390402333. The cubic root of 31900345 is about 317.1503000773.

The spelling of 31900345 in words is "thirty-one million, nine hundred thousand, three hundred forty-five".