31699818189 has 12 divisors (see below), whose sum is σ = 49310828476. Its totient is φ = 19507580352.

The previous prime is 31699818169. The next prime is 31699818193. The reversal of 31699818189 is 98181899613.

31699818189 is a `hidden beast` number, since 316 + 99 + 81 + 81 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7723773225 + 23976044964 = 87885^2 + 154842^2 .

It is not a de Polignac number, because 31699818189 - 2⁷ = 31699818061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31699818169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135469192 + ... + 135469425.

Almost surely, 2^31699818189 is an apocalyptic number.

31699818189 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

31699818189 is a deficient number, since it is larger than the sum of its proper divisors (17611010287).

31699818189 is a wasteful number, since it uses less digits than its factorization.

31699818189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270938636 (or 270938633 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 63.

The spelling of 31699818189 in words is "thirty-one billion, six hundred ninety-nine million, eight hundred eighteen thousand, one hundred eighty-nine".