31713725 has 6 divisors (see below), whose sum is σ = 39325050. Its totient is φ = 25370960.

The previous prime is 31713683. The next prime is 31713749. The reversal of 31713725 is 52731713.

It can be written as a sum of positive squares in 3 ways, for example, as 5968249 + 25745476 = 2443^2 + 5074^2 .

It is not a de Polignac number, because 31713725 - 2¹⁶ = 31648189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 634250 + ... + 634299.

It is an arithmetic number, because the mean of its divisors is an integer number (6554175).

Almost surely, 2^31713725 is an apocalyptic number.

It is an amenable number.

31713725 is a deficient number, since it is larger than the sum of its proper divisors (7611325).

31713725 is a wasteful number, since it uses less digits than its factorization.

31713725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268559 (or 1268554 counting only the distinct ones).

The product of its digits is 4410, while the sum is 29.

The square root of 31713725 is about 5631.4940291187. The cubic root of 31713725 is about 316.5306371733.

The spelling of 31713725 in words is "thirty-one million, seven hundred thirteen thousand, seven hundred twenty-five".