79331591 has 4 divisors (see below), whose sum is σ = 79370592. Its totient is φ = 79292592.

The previous prime is 79331587. The next prime is 79331621. The reversal of 79331591 is 19513397.

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 79331591 - 2² = 79331587 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 (79331891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16271 + ... + 20576.

It is an arithmetic number, because the mean of its divisors is an integer number (19842648).

Almost surely, 2^79331591 is an apocalyptic number.

79331591 is a deficient number, since it is larger than the sum of its proper divisors (39001).

79331591 is a wasteful number, since it uses less digits than its factorization.

79331591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39000.

The product of its digits is 25515, while the sum is 38.

The square root of 79331591 is about 8906.8283356086. The cubic root of 79331591 is about 429.6835439794.

The spelling of 79331591 in words is "seventy-nine million, three hundred thirty-one thousand, five hundred ninety-one".