31440643925 has 12 divisors (see below), whose sum is σ = 38993026980. Its totient is φ = 25148238720.

The previous prime is 31440643907. The next prime is 31440643939. The reversal of 31440643925 is 52934604413.

It can be written as a sum of positive squares in 6 ways, for example, as 5879669041 + 25560974884 = 76679^2 + 159878^2 .

It is not a de Polignac number, because 31440643925 - 2⁸ = 31440643669 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47441 + ... + 255209.

It is an arithmetic number, because the mean of its divisors is an integer number (3249418915).

Almost surely, 2^31440643925 is an apocalyptic number.

It is an amenable number.

31440643925 is a deficient number, since it is larger than the sum of its proper divisors (7552383055).

31440643925 is a wasteful number, since it uses less digits than its factorization.

31440643925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213832 (or 213827 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 31440643925 in words is "thirty-one billion, four hundred forty million, six hundred forty-three thousand, nine hundred twenty-five".