31424725 has 6 divisors (see below), whose sum is σ = 38966690. Its totient is φ = 25139760.

The previous prime is 31424711. The next prime is 31424741. The reversal of 31424725 is 52742413.

It can be written as a sum of positive squares in 3 ways, for example, as 4363921 + 27060804 = 2089^2 + 5202^2 .

It is not a de Polignac number, because 31424725 - 2⁷ = 31424597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31424693 and 31424702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 628470 + ... + 628519.

Almost surely, 2^31424725 is an apocalyptic number.

It is an amenable number.

31424725 is a deficient number, since it is larger than the sum of its proper divisors (7541965).

31424725 is a wasteful number, since it uses less digits than its factorization.

31424725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256999 (or 1256994 counting only the distinct ones).

The product of its digits is 6720, while the sum is 28.

The square root of 31424725 is about 5605.7760390511. The cubic root of 31424725 is about 315.5662109895.

The spelling of 31424725 in words is "thirty-one million, four hundred twenty-four thousand, seven hundred twenty-five".