31421507625 has 24 divisors (see below), whose sum is σ = 56642506440. Its totient is φ = 16758136800.

The previous prime is 31421507563. The next prime is 31421507639. The reversal of 31421507625 is 52670512413.

31421507625 is a `hidden beast` number, since 3 + 1 + 4 + 21 + 5 + 0 + 7 + 625 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1278992169 + 30142515456 = 35763^2 + 173616^2 .

It is not a de Polignac number, because 31421507625 - 2¹⁶ = 31421442089 is a prime.

It is a super-2 number, since 2×31421507625² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31421507625.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13963990 + ... + 13966239.

It is an arithmetic number, because the mean of its divisors is an integer number (2360104435).

Almost surely, 2^31421507625 is an apocalyptic number.

It is an amenable number.

31421507625 is a deficient number, since it is larger than the sum of its proper divisors (25220998815).

31421507625 is a wasteful number, since it uses less digits than its factorization.

31421507625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27930250 (or 27930237 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 31421507625 in words is "thirty-one billion, four hundred twenty-one million, five hundred seven thousand, six hundred twenty-five".