188100332981 has 12 divisors (see below), whose sum is σ = 214510027200. Its totient is φ = 163565501880.

The previous prime is 188100332977. The next prime is 188100332989. The reversal of 188100332981 is 189233001881.

It is not a de Polignac number, because 188100332981 - 2² = 188100332977 is a prime.

It is a super-2 number, since 2×188100332981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188100332989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16156781 + ... + 16168418.

It is an arithmetic number, because the mean of its divisors is an integer number (17875835600).

Almost surely, 2^188100332981 is an apocalyptic number.

188100332981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

188100332981 is a deficient number, since it is larger than the sum of its proper divisors (26409694219).

188100332981 is a wasteful number, since it uses less digits than its factorization.

188100332981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32325256 (or 32325233 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 44.

The spelling of 188100332981 in words is "one hundred eighty-eight billion, one hundred million, three hundred thirty-two thousand, nine hundred eighty-one".