79018817 has 2 divisors, whose sum is σ = 79018818. Its totient is φ = 79018816.

The previous prime is 79018799. The next prime is 79018829. The reversal of 79018817 is 71881097.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77986561 + 1032256 = 8831^2 + 1016^2 .

It is an emirp because it is prime and its reverse (71881097) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79018817 - 2²² = 74824513 is a prime.

It is not a weakly prime, because it can be changed into another prime (79018517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39509408 + 39509409.

It is an arithmetic number, because the mean of its divisors is an integer number (39509409).

Almost surely, 2^79018817 is an apocalyptic number.

It is an amenable number.

79018817 is a deficient number, since it is larger than the sum of its proper divisors (1).

79018817 is an equidigital number, since it uses as much as digits as its factorization.

79018817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 79018817 is about 8889.2528932414. The cubic root of 79018817 is about 429.1181078227.

The spelling of 79018817 in words is "seventy-nine million, eighteen thousand, eight hundred seventeen".