31725945 has 16 divisors (see below), whose sum is σ = 56401920. Its totient is φ = 16920432.

The previous prime is 31725943. The next prime is 31725949. The reversal of 31725945 is 54952713.

It is not a de Polignac number, because 31725945 - 2¹ = 31725943 is a prime.

It is a super-2 number, since 2×31725945² = 2013071172286050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31725943) 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, 117369 + ... + 117638.

It is an arithmetic number, because the mean of its divisors is an integer number (3525120).

Almost surely, 2^31725945 is an apocalyptic number.

It is an amenable number.

31725945 is a deficient number, since it is larger than the sum of its proper divisors (24675975).

31725945 is a wasteful number, since it uses less digits than its factorization.

31725945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235021 (or 235015 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 31725945 is about 5632.5788942544. The cubic root of 31725945 is about 316.5712873721.

It can be divided in two parts, 317 and 25945, that added together give a palindrome (26262).

The spelling of 31725945 in words is "thirty-one million, seven hundred twenty-five thousand, nine hundred forty-five".