31401072639 has 6 divisors (see below), whose sum is σ = 45357104936. Its totient is φ = 20934048420.

The previous prime is 31401072631. The next prime is 31401072679. The reversal of 31401072639 is 93627010413.

31401072639 is a `hidden beast` number, since 3 + 1 + 4 + 0 + 10 + 7 + 2 + 639 = 666.

It is not a de Polignac number, because 31401072639 - 2³ = 31401072631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31401072631) 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, 1744504027 + ... + 1744504044.

Almost surely, 2^31401072639 is an apocalyptic number.

31401072639 is a deficient number, since it is larger than the sum of its proper divisors (13956032297).

31401072639 is a wasteful number, since it uses less digits than its factorization.

31401072639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3489008077 (or 3489008074 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The spelling of 31401072639 in words is "thirty-one billion, four hundred one million, seventy-two thousand, six hundred thirty-nine".