79971967 has 2 divisors, whose sum is σ = 79971968. Its totient is φ = 79971966.

The previous prime is 79971923. The next prime is 79971973. The reversal of 79971967 is 76917997.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79971967 - 2¹⁵ = 79939199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79971977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39985983 + 39985984.

It is an arithmetic number, because the mean of its divisors is an integer number (39985984).

Almost surely, 2^79971967 is an apocalyptic number.

79971967 is a deficient number, since it is larger than the sum of its proper divisors (1).

79971967 is an equidigital number, since it uses as much as digits as its factorization.

79971967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1500282, while the sum is 55.

The square root of 79971967 is about 8942.7046803526. The cubic root of 79971967 is about 430.8366027368.

The spelling of 79971967 in words is "seventy-nine million, nine hundred seventy-one thousand, nine hundred sixty-seven".