31391056 has 20 divisors (see below), whose sum is σ = 61132000. Its totient is φ = 15615072.

The previous prime is 31391039. The next prime is 31391071. The reversal of 31391056 is 65019313.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1746 + ... + 8113.

It is an arithmetic number, because the mean of its divisors is an integer number (3056600).

Almost surely, 2^31391056 is an apocalyptic number.

It is an amenable number.

31391056 is a deficient number, since it is larger than the sum of its proper divisors (29740944).

31391056 is a wasteful number, since it uses less digits than its factorization.

31391056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10066 (or 10060 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 31391056 is about 5602.7721709882. The cubic root of 31391056 is about 315.4534696630.

The spelling of 31391056 in words is "thirty-one million, three hundred ninety-one thousand, fifty-six".