79315777 has 2 divisors, whose sum is σ = 79315778. Its totient is φ = 79315776.

The previous prime is 79315759. The next prime is 79315793. The reversal of 79315777 is 77751397.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77422401 + 1893376 = 8799^2 + 1376^2 .

It is an emirp because it is prime and its reverse (77751397) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79315777 - 2²³ = 70927169 is a prime.

It is a super-2 number, since 2×79315777² = 12581984962227458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79315757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39657888 + 39657889.

It is an arithmetic number, because the mean of its divisors is an integer number (39657889).

Almost surely, 2^79315777 is an apocalyptic number.

It is an amenable number.

79315777 is a deficient number, since it is larger than the sum of its proper divisors (1).

79315777 is an equidigital number, since it uses as much as digits as its factorization.

79315777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324135, while the sum is 46.

The square root of 79315777 is about 8905.9405455011. The cubic root of 79315777 is about 429.6549909695.

The spelling of 79315777 in words is "seventy-nine million, three hundred fifteen thousand, seven hundred seventy-seven".