31408320775 has 12 divisors (see below), whose sum is σ = 41942188792. Its totient is φ = 23193836640.

The previous prime is 31408320763. The next prime is 31408320793. The reversal of 31408320775 is 57702380413.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-31408320775 is a prime.

It is a super-2 number, since 2×31408320775² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

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, 48320169 + ... + 48320818.

Almost surely, 2^31408320775 is an apocalyptic number.

31408320775 is a deficient number, since it is larger than the sum of its proper divisors (10533868017).

31408320775 is a wasteful number, since it uses less digits than its factorization.

31408320775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96641010 (or 96641005 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 31408320775 in words is "thirty-one billion, four hundred eight million, three hundred twenty thousand, seven hundred seventy-five".