108318991 has 8 divisors (see below), whose sum is σ = 121978368. Its totient is φ = 95295000.

The previous prime is 108318979. The next prime is 108319049. The reversal of 108318991 is 199813801.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 108318991 - 2¹⁵ = 108286223 is a prime.

It is a super-2 number, since 2×108318991² = 23466007622516162, which 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 (108318941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158485 + ... + 159166.

It is an arithmetic number, because the mean of its divisors is an integer number (15247296).

Almost surely, 2^108318991 is an apocalyptic number.

108318991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

108318991 is a deficient number, since it is larger than the sum of its proper divisors (13659377).

108318991 is a wasteful number, since it uses less digits than its factorization.

108318991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317693.

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 108318991 is about 10407.6409911180. The cubic root of 108318991 is about 476.6887127452.

The spelling of 108318991 in words is "one hundred eight million, three hundred eighteen thousand, nine hundred ninety-one".