79912621 has 2 divisors, whose sum is σ = 79912622. Its totient is φ = 79912620.

The previous prime is 79912601. The next prime is 79912633. The reversal of 79912621 is 12621997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78322500 + 1590121 = 8850^2 + 1261^2 .

It is an emirp because it is prime and its reverse (12621997) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79912621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79912601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39956310 + 39956311.

It is an arithmetic number, because the mean of its divisors is an integer number (39956311).

Almost surely, 2^79912621 is an apocalyptic number.

It is an amenable number.

79912621 is a deficient number, since it is larger than the sum of its proper divisors (1).

79912621 is an equidigital number, since it uses as much as digits as its factorization.

79912621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 37.

The square root of 79912621 is about 8939.3859408798. The cubic root of 79912621 is about 430.7300038987.

The spelling of 79912621 in words is "seventy-nine million, nine hundred twelve thousand, six hundred twenty-one".