31253725 has 6 divisors (see below), whose sum is σ = 38754650. Its totient is φ = 25002960.

The previous prime is 31253723. The next prime is 31253759. The reversal of 31253725 is 52735213.

It can be written as a sum of positive squares in 3 ways, for example, as 10850436 + 20403289 = 3294^2 + 4517^2 .

It is not a de Polignac number, because 31253725 - 2¹ = 31253723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31253693 and 31253702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31253723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 625050 + ... + 625099.

Almost surely, 2^31253725 is an apocalyptic number.

It is an amenable number.

31253725 is a deficient number, since it is larger than the sum of its proper divisors (7500925).

31253725 is a wasteful number, since it uses less digits than its factorization.

31253725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250159 (or 1250154 counting only the distinct ones).

The product of its digits is 6300, while the sum is 28.

The square root of 31253725 is about 5590.5031079501. The cubic root of 31253725 is about 314.9927771922.

Adding to 31253725 its reverse (52735213), we get a palindrome (83988938).

The spelling of 31253725 in words is "thirty-one million, two hundred fifty-three thousand, seven hundred twenty-five".