79312621 has 2 divisors, whose sum is σ = 79312622. Its totient is φ = 79312620.

The previous prime is 79312619. The next prime is 79312637. The reversal of 79312621 is 12621397.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73719396 + 5593225 = 8586^2 + 2365^2 .

It is a cyclic number.

It is not a de Polignac number, because 79312621 - 2¹ = 79312619 is a prime.

Together with 79312619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79312661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39656310 + 39656311.

It is an arithmetic number, because the mean of its divisors is an integer number (39656311).

Almost surely, 2^79312621 is an apocalyptic number.

It is an amenable number.

79312621 is a deficient number, since it is larger than the sum of its proper divisors (1).

79312621 is an equidigital number, since it uses as much as digits as its factorization.

79312621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 79312621 is about 8905.7633586347. The cubic root of 79312621 is about 429.6492921910.

The spelling of 79312621 in words is "seventy-nine million, three hundred twelve thousand, six hundred twenty-one".