31056913 has 4 divisors (see below), whose sum is σ = 31135540. Its totient is φ = 30978288.

The previous prime is 31056911. The next prime is 31056917. The reversal of 31056913 is 31965013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31965013 = 109 ⋅293257.

It can be written as a sum of positive squares in 2 ways, for example, as 22014864 + 9042049 = 4692^2 + 3007^2 .

It is a cyclic number.

It is not a de Polignac number, because 31056913 - 2¹ = 31056911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31056911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38718 + ... + 39511.

It is an arithmetic number, because the mean of its divisors is an integer number (7783885).

Almost surely, 2^31056913 is an apocalyptic number.

It is an amenable number.

31056913 is a deficient number, since it is larger than the sum of its proper divisors (78627).

31056913 is an equidigital number, since it uses as much as digits as its factorization.

31056913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78626.

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

The square root of 31056913 is about 5572.8729574610. The cubic root of 31056913 is about 314.3301900753.

The spelling of 31056913 in words is "thirty-one million, fifty-six thousand, nine hundred thirteen".