31085725 has 12 divisors (see below), whose sum is σ = 42050880. Its totient is φ = 22607600.

The previous prime is 31085723. The next prime is 31085731. The reversal of 31085725 is 52758013.

It is not a de Polignac number, because 31085725 - 2¹ = 31085723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31085723) 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, 56245 + ... + 56794.

It is an arithmetic number, because the mean of its divisors is an integer number (3504240).

Almost surely, 2^31085725 is an apocalyptic number.

It is an amenable number.

31085725 is a deficient number, since it is larger than the sum of its proper divisors (10965155).

31085725 is a wasteful number, since it uses less digits than its factorization.

31085725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113060 (or 113055 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 31085725 is about 5575.4573803411. The cubic root of 31085725 is about 314.4273630972.

The spelling of 31085725 in words is "thirty-one million, eighty-five thousand, seven hundred twenty-five".