31816139990 has 16 divisors (see below), whose sum is σ = 58239714960. Its totient is φ = 12510753120.

The previous prime is 31816139983. The next prime is 31816140017. The reversal of 31816139990 is 9993161813.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26962241 + ... + 26963420.

It is an arithmetic number, because the mean of its divisors is an integer number (3639982185).

Almost surely, 2^31816139990 is an apocalyptic number.

31816139990 is a deficient number, since it is larger than the sum of its proper divisors (26423574970).

31816139990 is a wasteful number, since it uses less digits than its factorization.

31816139990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53925727.

The product of its (nonzero) digits is 314928, while the sum is 50.

The spelling of 31816139990 in words is "thirty-one billion, eight hundred sixteen million, one hundred thirty-nine thousand, nine hundred ninety".