79637581 has 2 divisors, whose sum is σ = 79637582. Its totient is φ = 79637580.

The previous prime is 79637563. The next prime is 79637603. The reversal of 79637581 is 18573697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56115081 + 23522500 = 7491^2 + 4850^2 .

It is a cyclic number.

It is not a de Polignac number, because 79637581 - 2⁵ = 79637549 is a prime.

It is a super-2 number, since 2×79637581² = 12684288615063122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79637561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39818790 + 39818791.

It is an arithmetic number, because the mean of its divisors is an integer number (39818791).

Almost surely, 2^79637581 is an apocalyptic number.

It is an amenable number.

79637581 is a deficient number, since it is larger than the sum of its proper divisors (1).

79637581 is an equidigital number, since it uses as much as digits as its factorization.

79637581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 46.

The square root of 79637581 is about 8923.9890743994. The cubic root of 79637581 is about 430.2352795694.

The spelling of 79637581 in words is "seventy-nine million, six hundred thirty-seven thousand, five hundred eighty-one".