79812617 has 2 divisors, whose sum is σ = 79812618. Its totient is φ = 79812616.

The previous prime is 79812587. The next prime is 79812653. The reversal of 79812617 is 71621897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61011721 + 18800896 = 7811^2 + 4336^2 .

It is a cyclic number.

It is not a de Polignac number, because 79812617 - 2²⁰ = 78764041 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79812017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39906308 + 39906309.

It is an arithmetic number, because the mean of its divisors is an integer number (39906309).

Almost surely, 2^79812617 is an apocalyptic number.

It is an amenable number.

79812617 is a deficient number, since it is larger than the sum of its proper divisors (1).

79812617 is an equidigital number, since it uses as much as digits as its factorization.

79812617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 41.

The square root of 79812617 is about 8933.7907407774. The cubic root of 79812617 is about 430.5502546367.

The spelling of 79812617 in words is "seventy-nine million, eight hundred twelve thousand, six hundred seventeen".