79113031021 has 2 divisors, whose sum is σ = 79113031022. Its totient is φ = 79113031020.

The previous prime is 79113031009. The next prime is 79113031027. The reversal of 79113031021 is 12013031197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59677604100 + 19435426921 = 244290^2 + 139411^2 .

It is an emirp because it is prime and its reverse (12013031197) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79113031021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79113031027) 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, 39556515510 + 39556515511.

It is an arithmetic number, because the mean of its divisors is an integer number (39556515511).

Almost surely, 2^79113031021 is an apocalyptic number.

It is an amenable number.

79113031021 is a deficient number, since it is larger than the sum of its proper divisors (1).

79113031021 is an equidigital number, since it uses as much as digits as its factorization.

79113031021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 28.

The spelling of 79113031021 in words is "seventy-nine billion, one hundred thirteen million, thirty-one thousand, twenty-one".