79857251 has 2 divisors, whose sum is σ = 79857252. Its totient is φ = 79857250.

The previous prime is 79857221. The next prime is 79857257. The reversal of 79857251 is 15275897.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79857251 - 2⁶ = 79857187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79857257) 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, 39928625 + 39928626.

It is an arithmetic number, because the mean of its divisors is an integer number (39928626).

Almost surely, 2^79857251 is an apocalyptic number.

79857251 is a deficient number, since it is larger than the sum of its proper divisors (1).

79857251 is an equidigital number, since it uses as much as digits as its factorization.

79857251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 176400, while the sum is 44.

The square root of 79857251 is about 8936.2884353629. The cubic root of 79857251 is about 430.6304992546.

It can be divided in two parts, 79857 and 251, that added together give a palindrome (80108).

The spelling of 79857251 in words is "seventy-nine million, eight hundred fifty-seven thousand, two hundred fifty-one".