100979891 has 4 divisors (see below), whose sum is σ = 101648784. Its totient is φ = 100311000.

The previous prime is 100979869. The next prime is 100979897. The reversal of 100979891 is 198979001.

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 100979891 - 2¹⁴ = 100963507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100979897) 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, 334220 + ... + 334521.

It is an arithmetic number, because the mean of its divisors is an integer number (25412196).

Almost surely, 2^100979891 is an apocalyptic number.

100979891 is a deficient number, since it is larger than the sum of its proper divisors (668893).

100979891 is an equidigital number, since it uses as much as digits as its factorization.

100979891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668892.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 100979891 is about 10048.8751111754. The cubic root of 100979891 is about 465.6700418629.

The spelling of 100979891 in words is "one hundred million, nine hundred seventy-nine thousand, eight hundred ninety-one".