108017991 has 6 divisors (see below), whose sum is σ = 156026000. Its totient is φ = 72011988.

The previous prime is 108017969. The next prime is 108017999. The reversal of 108017991 is 199710801.

It is not a de Polignac number, because 108017991 - 2¹⁸ = 107755847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108017999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6000991 + ... + 6001008.

Almost surely, 2^108017991 is an apocalyptic number.

108017991 is a deficient number, since it is larger than the sum of its proper divisors (48008009).

108017991 is a wasteful number, since it uses less digits than its factorization.

108017991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12002005 (or 12002002 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 36.

The square root of 108017991 is about 10393.1704017590. The cubic root of 108017991 is about 476.2467575781.

The spelling of 108017991 in words is "one hundred eight million, seventeen thousand, nine hundred ninety-one".