31925397 has 16 divisors (see below), whose sum is σ = 48773120. Its totient is φ = 18196272.

The previous prime is 31925389. The next prime is 31925407. The reversal of 31925397 is 79352913.

It is not a de Polignac number, because 31925397 - 2³ = 31925389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31925297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7488 + ... + 10950.

It is an arithmetic number, because the mean of its divisors is an integer number (3048320).

Almost surely, 2^31925397 is an apocalyptic number.

It is an amenable number.

31925397 is a deficient number, since it is larger than the sum of its proper divisors (16847723).

31925397 is a wasteful number, since it uses less digits than its factorization.

31925397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3912.

The product of its digits is 51030, while the sum is 39.

The square root of 31925397 is about 5650.2563658652. The cubic root of 31925397 is about 317.2332999150.

The spelling of 31925397 in words is "thirty-one million, nine hundred twenty-five thousand, three hundred ninety-seven".