79908191 has 4 divisors (see below), whose sum is σ = 87172584. Its totient is φ = 72643800.

The previous prime is 79908161. The next prime is 79908229. The reversal of 79908191 is 19180997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19180997 = 11 ⋅1743727.

It is a cyclic number.

It is not a de Polignac number, because 79908191 - 2¹⁰ = 79907167 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 (79908151) 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, 3632180 + ... + 3632201.

It is an arithmetic number, because the mean of its divisors is an integer number (21793146).

Almost surely, 2^79908191 is an apocalyptic number.

79908191 is a deficient number, since it is larger than the sum of its proper divisors (7264393).

79908191 is a wasteful number, since it uses less digits than its factorization.

79908191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7264392.

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

The square root of 79908191 is about 8939.1381575631. The cubic root of 79908191 is about 430.7220445003.

The spelling of 79908191 in words is "seventy-nine million, nine hundred eight thousand, one hundred ninety-one".