79397557 has 2 divisors, whose sum is σ = 79397558. Its totient is φ = 79397556.

The previous prime is 79397503. The next prime is 79397573. The reversal of 79397557 is 75579397.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56415121 + 22982436 = 7511^2 + 4794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79397557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79397957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39698778 + 39698779.

It is an arithmetic number, because the mean of its divisors is an integer number (39698779).

Almost surely, 2^79397557 is an apocalyptic number.

It is an amenable number.

79397557 is a deficient number, since it is larger than the sum of its proper divisors (1).

79397557 is an equidigital number, since it uses as much as digits as its factorization.

79397557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2083725, while the sum is 52.

The square root of 79397557 is about 8910.5306800437. The cubic root of 79397557 is about 429.8026081571.

The spelling of 79397557 in words is "seventy-nine million, three hundred ninety-seven thousand, five hundred fifty-seven".