79619971 has 2 divisors, whose sum is σ = 79619972. Its totient is φ = 79619970.

The previous prime is 79619933. The next prime is 79619977. The reversal of 79619971 is 17991697.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79619971 - 2¹⁵ = 79587203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79619977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39809985 + 39809986.

It is an arithmetic number, because the mean of its divisors is an integer number (39809986).

Almost surely, 2^79619971 is an apocalyptic number.

79619971 is a deficient number, since it is larger than the sum of its proper divisors (1).

79619971 is an equidigital number, since it uses as much as digits as its factorization.

79619971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 214326, while the sum is 49.

The square root of 79619971 is about 8923.0023534683. The cubic root of 79619971 is about 430.2035650543.

The spelling of 79619971 in words is "seventy-nine million, six hundred nineteen thousand, nine hundred seventy-one".