79869997 has 2 divisors, whose sum is σ = 79869998. Its totient is φ = 79869996.

The previous prime is 79869989. The next prime is 79870001. The reversal of 79869997 is 79996897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41293476 + 38576521 = 6426^2 + 6211^2 .

It is a cyclic number.

It is not a de Polignac number, because 79869997 - 2³ = 79869989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79869917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39934998 + 39934999.

It is an arithmetic number, because the mean of its divisors is an integer number (39934999).

Almost surely, 2^79869997 is an apocalyptic number.

It is an amenable number.

79869997 is a deficient number, since it is larger than the sum of its proper divisors (1).

79869997 is an equidigital number, since it uses as much as digits as its factorization.

79869997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15431472, while the sum is 64.

The square root of 79869997 is about 8937.0015665211. The cubic root of 79869997 is about 430.6534089853.

The spelling of 79869997 in words is "seventy-nine million, eight hundred sixty-nine thousand, nine hundred ninety-seven".