31257172 has 6 divisors (see below), whose sum is σ = 54700058. Its totient is φ = 15628584.

The previous prime is 31257143. The next prime is 31257179. The reversal of 31257172 is 27175213.

It can be written as a sum of positive squares in only one way, i.e., 22695696 + 8561476 = 4764^2 + 2926^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31257172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31257179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3907143 + ... + 3907150.

Almost surely, 2^31257172 is an apocalyptic number.

It is an amenable number.

31257172 is a deficient number, since it is larger than the sum of its proper divisors (23442886).

31257172 is a wasteful number, since it uses less digits than its factorization.

31257172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7814297 (or 7814295 counting only the distinct ones).

The product of its digits is 2940, while the sum is 28.

The square root of 31257172 is about 5590.8113901293. The cubic root of 31257172 is about 315.0043570406.

The spelling of 31257172 in words is "thirty-one million, two hundred fifty-seven thousand, one hundred seventy-two".