31606425 has 18 divisors (see below), whose sum is σ = 56611022. Its totient is φ = 16856640.

The previous prime is 31606423. The next prime is 31606429. The reversal of 31606425 is 52460613.

31606425 is a `hidden beast` number, since 3 + 16 + 0 + 642 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 870489 + 30735936 = 933^2 + 5544^2 .

It is not a de Polignac number, because 31606425 - 2¹ = 31606423 is a prime.

It is a super-2 number, since 2×31606425² = 1997932202561250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31606423) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 70012 + ... + 70461.

Almost surely, 2^31606425 is an apocalyptic number.

It is an amenable number.

31606425 is a deficient number, since it is larger than the sum of its proper divisors (25004597).

31606425 is a wasteful number, since it uses less digits than its factorization.

31606425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140489 (or 140481 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 31606425 is about 5621.9591780802. The cubic root of 31606425 is about 316.1732512806.

The spelling of 31606425 in words is "thirty-one million, six hundred six thousand, four hundred twenty-five".