79618391 has 2 divisors, whose sum is σ = 79618392. Its totient is φ = 79618390.

The previous prime is 79618373. The next prime is 79618439. The reversal of 79618391 is 19381697.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79618391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79618321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39809195 + 39809196.

It is an arithmetic number, because the mean of its divisors is an integer number (39809196).

Almost surely, 2^79618391 is an apocalyptic number.

79618391 is a deficient number, since it is larger than the sum of its proper divisors (1).

79618391 is an equidigital number, since it uses as much as digits as its factorization.

79618391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 79618391 is about 8922.9138178064. The cubic root of 79618391 is about 430.2007193439.

The spelling of 79618391 in words is "seventy-nine million, six hundred eighteen thousand, three hundred ninety-one".