31990180186 has 16 divisors (see below), whose sum is σ = 50514307200. Its totient is φ = 15152194368.

The previous prime is 31990180181. The next prime is 31990180237. The reversal of 31990180186 is 68108109913.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31990180181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 990306 + ... + 1022098.

It is an arithmetic number, because the mean of its divisors is an integer number (3157144200).

Almost surely, 2^31990180186 is an apocalyptic number.

31990180186 is a deficient number, since it is larger than the sum of its proper divisors (18524127014).

31990180186 is a wasteful number, since it uses less digits than its factorization.

31990180186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58293.

The product of its (nonzero) digits is 93312, while the sum is 46.

The spelling of 31990180186 in words is "thirty-one billion, nine hundred ninety million, one hundred eighty thousand, one hundred eighty-six".