31977913 has 16 divisors (see below), whose sum is σ = 35691840. Its totient is φ = 28408000.

The previous prime is 31977899. The next prime is 31977919.

It is a happy number.

31977913 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31977913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31977919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118743 + ... + 119011.

It is an arithmetic number, because the mean of its divisors is an integer number (2230740).

Almost surely, 2^31977913 is an apocalyptic number.

It is an amenable number.

31977913 is a deficient number, since it is larger than the sum of its proper divisors (3713927).

31977913 is a wasteful number, since it uses less digits than its factorization.

31977913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488.

The product of its digits is 35721, while the sum is 40.

The square root of 31977913 is about 5654.9016790745. The cubic root of 31977913 is about 317.4071499838.

The spelling of 31977913 in words is "thirty-one million, nine hundred seventy-seven thousand, nine hundred thirteen".