79997279 has 2 divisors, whose sum is σ = 79997280. Its totient is φ = 79997278.

The previous prime is 79997251. The next prime is 79997287. The reversal of 79997279 is 97279997.

It is a strong prime.

It is an emirp because it is prime and its reverse (97279997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79997279 - 2²⁴ = 63220063 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79997579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39998639 + 39998640.

It is an arithmetic number, because the mean of its divisors is an integer number (39998640).

Almost surely, 2^79997279 is an apocalyptic number.

79997279 is a deficient number, since it is larger than the sum of its proper divisors (1).

79997279 is an equidigital number, since it uses as much as digits as its factorization.

79997279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4500846, while the sum is 59.

The square root of 79997279 is about 8944.1198001816. The cubic root of 79997279 is about 430.8820527703.

The spelling of 79997279 in words is "seventy-nine million, nine hundred ninety-seven thousand, two hundred seventy-nine".