31405137936 has 20 divisors (see below), whose sum is σ = 81129939792. Its totient is φ = 10468379296.

The previous prime is 31405137931. The next prime is 31405137949. The reversal of 31405137936 is 63973150413.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31405137931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327136806 + ... + 327136901.

Almost surely, 2^31405137936 is an apocalyptic number.

It is an amenable number.

31405137936 is an abundant number, since it is smaller than the sum of its proper divisors (49724801856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31405137936 is a wasteful number, since it uses less digits than its factorization.

31405137936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654273718 (or 654273712 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 42.

The spelling of 31405137936 in words is "thirty-one billion, four hundred five million, one hundred thirty-seven thousand, nine hundred thirty-six".