79118257 has 2 divisors, whose sum is σ = 79118258. Its totient is φ = 79118256.

The previous prime is 79118251. The next prime is 79118269. The reversal of 79118257 is 75281197.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55294096 + 23824161 = 7436^2 + 4881^2 .

It is a cyclic number.

It is not a de Polignac number, because 79118257 - 2⁷ = 79118129 is a prime.

It is not a weakly prime, because it can be changed into another prime (79118251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39559128 + 39559129.

It is an arithmetic number, because the mean of its divisors is an integer number (39559129).

Almost surely, 2^79118257 is an apocalyptic number.

It is an amenable number.

79118257 is a deficient number, since it is larger than the sum of its proper divisors (1).

79118257 is an equidigital number, since it uses as much as digits as its factorization.

79118257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 40.

The square root of 79118257 is about 8894.8444056094. The cubic root of 79118257 is about 429.2980380343.

It can be divided in two parts, 79 and 118257, that added together give a square (118336 = 344²).

The spelling of 79118257 in words is "seventy-nine million, one hundred eighteen thousand, two hundred fifty-seven".