108771920631 has 16 divisors (see below), whose sum is σ = 175793003520. Its totient is φ = 65922375960.

The previous prime is 108771920629. The next prime is 108771920639. The reversal of 108771920631 is 136029177801.

108771920631 is a `hidden beast` number, since 1 + 0 + 8 + 7 + 7 + 1 + 9 + 2 + 0 + 631 = 666.

It is not a de Polignac number, because 108771920631 - 2¹ = 108771920629 is a prime.

It is a super-2 number, since 2×108771920631² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108771920639) 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 15 ways as a sum of consecutive naturals, for example, 183117415 + ... + 183118008.

It is an arithmetic number, because the mean of its divisors is an integer number (10987062720).

Almost surely, 2^108771920631 is an apocalyptic number.

108771920631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

108771920631 is a deficient number, since it is larger than the sum of its proper divisors (67021082889).

108771920631 is a wasteful number, since it uses less digits than its factorization.

108771920631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366235443 (or 366235437 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The spelling of 108771920631 in words is "one hundred eight billion, seven hundred seventy-one million, nine hundred twenty thousand, six hundred thirty-one".