31155890886138 has 16 divisors (see below), whose sum is σ = 62485352199360. Its totient is φ = 10356368557536.

The previous prime is 31155890886121. The next prime is 31155890886163. The reversal of 31155890886138 is 83168809855113.

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, 7232098795 + ... + 7232103102.

It is an arithmetic number, because the mean of its divisors is an integer number (3905334512460).

Almost surely, 2^{31155890886138} is an apocalyptic number.

31155890886138 is an abundant number, since it is smaller than the sum of its proper divisors (31329461313222).

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

31155890886138 is a wasteful number, since it uses less digits than its factorization.

31155890886138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14464202261.

The product of its (nonzero) digits is 49766400, while the sum is 66.

The spelling of 31155890886138 in words is "thirty-one trillion, one hundred fifty-five billion, eight hundred ninety million, eight hundred eighty-six thousand, one hundred thirty-eight".