79511021 has 2 divisors, whose sum is σ = 79511022. Its totient is φ = 79511020.

The previous prime is 79510993. The next prime is 79511059. The reversal of 79511021 is 12011597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60684100 + 18826921 = 7790^2 + 4339^2 .

It is a cyclic number.

It is not a de Polignac number, because 79511021 - 2¹⁴ = 79494637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79511071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39755510 + 39755511.

It is an arithmetic number, because the mean of its divisors is an integer number (39755511).

Almost surely, 2^79511021 is an apocalyptic number.

It is an amenable number.

79511021 is a deficient number, since it is larger than the sum of its proper divisors (1).

79511021 is an equidigital number, since it uses as much as digits as its factorization.

79511021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 79511021 is about 8916.8952556369. The cubic root of 79511021 is about 430.0072488412.

The spelling of 79511021 in words is "seventy-nine million, five hundred eleven thousand, twenty-one".