79149979 has 2 divisors, whose sum is σ = 79149980. Its totient is φ = 79149978.

The previous prime is 79149937. The next prime is 79149989. The reversal of 79149979 is 97994197.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79149979 - 2¹³ = 79141787 is a prime.

It is not a weakly prime, because it can be changed into another prime (79149989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39574989 + 39574990.

It is an arithmetic number, because the mean of its divisors is an integer number (39574990).

Almost surely, 2^79149979 is an apocalyptic number.

79149979 is a deficient number, since it is larger than the sum of its proper divisors (1).

79149979 is an equidigital number, since it uses as much as digits as its factorization.

79149979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1285956, while the sum is 55.

The square root of 79149979 is about 8896.6273946929. The cubic root of 79149979 is about 429.3554052094.

The spelling of 79149979 in words is "seventy-nine million, one hundred forty-nine thousand, nine hundred seventy-nine".