79908091 has 4 divisors (see below), whose sum is σ = 84113800. Its totient is φ = 75702384.

The previous prime is 79908077. The next prime is 79908119. The reversal of 79908091 is 19080997.

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

It is not a de Polignac number, because 79908091 - 2¹⁹ = 79383803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79908071) 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, 2102826 + ... + 2102863.

It is an arithmetic number, because the mean of its divisors is an integer number (21028450).

Almost surely, 2^79908091 is an apocalyptic number.

79908091 is a deficient number, since it is larger than the sum of its proper divisors (4205709).

79908091 is a wasteful number, since it uses less digits than its factorization.

79908091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4205708.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 79908091 is about 8939.1325641809. The cubic root of 79908091 is about 430.7218648265.

The spelling of 79908091 in words is "seventy-nine million, nine hundred eight thousand, ninety-one".