31138084906 has 16 divisors (see below), whose sum is σ = 49299384960. Its totient is φ = 14709422880.

The previous prime is 31138084897. The next prime is 31138084919. The reversal of 31138084906 is 60948083113.

It is a super-2 number, since 2×31138084906² (a number of 22 digits) contains 22 as substring.

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, 1102435 + ... + 1130326.

It is an arithmetic number, because the mean of its divisors is an integer number (3081211560).

Almost surely, 2^31138084906 is an apocalyptic number.

31138084906 is a deficient number, since it is larger than the sum of its proper divisors (18161300054).

31138084906 is a wasteful number, since it uses less digits than its factorization.

31138084906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2233149.

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 31138084906 in words is "thirty-one billion, one hundred thirty-eight million, eighty-four thousand, nine hundred six".