108166891 has 4 divisors (see below), whose sum is σ = 123619312. Its totient is φ = 92714472.

The previous prime is 108166871. The next prime is 108166901. The reversal of 108166891 is 198661801.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 108166891 - 2⁷ = 108166763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108166811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7726200 + ... + 7726213.

It is an arithmetic number, because the mean of its divisors is an integer number (30904828).

Almost surely, 2^108166891 is an apocalyptic number.

108166891 is a deficient number, since it is larger than the sum of its proper divisors (15452421).

108166891 is an equidigital number, since it uses as much as digits as its factorization.

108166891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15452420.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 108166891 is about 10400.3312928002. The cubic root of 108166891 is about 476.4654883732.

The spelling of 108166891 in words is "one hundred eight million, one hundred sixty-six thousand, eight hundred ninety-one".