79097581 has 2 divisors, whose sum is σ = 79097582. Its totient is φ = 79097580.

The previous prime is 79097561. The next prime is 79097639. The reversal of 79097581 is 18579097.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49829481 + 29268100 = 7059^2 + 5410^2 .

It is a cyclic number.

It is not a de Polignac number, because 79097581 - 2¹⁵ = 79064813 is a prime.

It is a super-2 number, since 2×79097581² = 12512854640103122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79097521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39548790 + 39548791.

It is an arithmetic number, because the mean of its divisors is an integer number (39548791).

Almost surely, 2^79097581 is an apocalyptic number.

It is an amenable number.

79097581 is a deficient number, since it is larger than the sum of its proper divisors (1).

79097581 is an equidigital number, since it uses as much as digits as its factorization.

79097581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 79097581 is about 8893.6820833668. The cubic root of 79097581 is about 429.2606385773.

The spelling of 79097581 in words is "seventy-nine million, ninety-seven thousand, five hundred eighty-one".