79565081 has 2 divisors, whose sum is σ = 79565082. Its totient is φ = 79565080.

The previous prime is 79565069. The next prime is 79565107. The reversal of 79565081 is 18056597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61152400 + 18412681 = 7820^2 + 4291^2 .

It is a cyclic number.

It is not a de Polignac number, because 79565081 - 2²⁶ = 12456217 is a prime.

It is a super-2 number, since 2×79565081² = 12661204229073122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79565011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39782540 + 39782541.

It is an arithmetic number, because the mean of its divisors is an integer number (39782541).

Almost surely, 2^79565081 is an apocalyptic number.

It is an amenable number.

79565081 is a deficient number, since it is larger than the sum of its proper divisors (1).

79565081 is an equidigital number, since it uses as much as digits as its factorization.

79565081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 79565081 is about 8919.9260647160. The cubic root of 79565081 is about 430.1046815625.

The spelling of 79565081 in words is "seventy-nine million, five hundred sixty-five thousand, eighty-one".