31621977 has 12 divisors (see below), whose sum is σ = 47251620. Its totient is φ = 20354208.

The previous prime is 31621963. The next prime is 31621979. The reversal of 31621977 is 77912613.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10055241 + 21566736 = 3171^2 + 4644^2 .

It is not a de Polignac number, because 31621977 - 2¹⁴ = 31605593 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31621979) 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, 60318 + ... + 60839.

It is an arithmetic number, because the mean of its divisors is an integer number (3937635).

Almost surely, 2^31621977 is an apocalyptic number.

It is an amenable number.

31621977 is a deficient number, since it is larger than the sum of its proper divisors (15629643).

31621977 is a wasteful number, since it uses less digits than its factorization.

31621977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121192 (or 121189 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 31621977 is about 5623.3421556935. The cubic root of 31621977 is about 316.2251006554.

The spelling of 31621977 in words is "thirty-one million, six hundred twenty-one thousand, nine hundred seventy-seven".