79700081 has 2 divisors, whose sum is σ = 79700082. Its totient is φ = 79700080.

The previous prime is 79700077. The next prime is 79700087. The reversal of 79700081 is 18000797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71910400 + 7789681 = 8480^2 + 2791^2 .

It is an emirp because it is prime and its reverse (18000797) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79700081 - 2² = 79700077 is a prime.

It is a super-2 number, since 2×79700081² = 12704205822813122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79700087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39850040 + 39850041.

It is an arithmetic number, because the mean of its divisors is an integer number (39850041).

Almost surely, 2^79700081 is an apocalyptic number.

It is an amenable number.

79700081 is a deficient number, since it is larger than the sum of its proper divisors (1).

79700081 is an equidigital number, since it uses as much as digits as its factorization.

79700081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 79700081 is about 8927.4901848168. The cubic root of 79700081 is about 430.3478004559.

The spelling of 79700081 in words is "seventy-nine million, seven hundred thousand, eighty-one".