79250813 has 2 divisors, whose sum is σ = 79250814. Its totient is φ = 79250812.

The previous prime is 79250797. The next prime is 79250819. The reversal of 79250813 is 31805297.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72965764 + 6285049 = 8542^2 + 2507^2 .

It is a cyclic number.

It is not a de Polignac number, because 79250813 - 2⁴ = 79250797 is a prime.

It is a super-2 number, since 2×79250813² = 12561382722321938, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79250819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39625406 + 39625407.

It is an arithmetic number, because the mean of its divisors is an integer number (39625407).

Almost surely, 2^79250813 is an apocalyptic number.

It is an amenable number.

79250813 is a deficient number, since it is larger than the sum of its proper divisors (1).

79250813 is an equidigital number, since it uses as much as digits as its factorization.

79250813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 79250813 is about 8902.2925698946. The cubic root of 79250813 is about 429.5376552099.

The spelling of 79250813 in words is "seventy-nine million, two hundred fifty thousand, eight hundred thirteen".