79581561 has 8 divisors (see below), whose sum is σ = 108976704. Its totient is φ = 51620400.

The previous prime is 79581553. The next prime is 79581617. The reversal of 79581561 is 16518597.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 79581561 - 2³ = 79581553 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (79580561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358365 + ... + 358586.

It is an arithmetic number, because the mean of its divisors is an integer number (13622088).

Almost surely, 2^79581561 is an apocalyptic number.

It is an amenable number.

79581561 is a deficient number, since it is larger than the sum of its proper divisors (29395143).

79581561 is a wasteful number, since it uses less digits than its factorization.

79581561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716991.

The product of its digits is 75600, while the sum is 42.

The square root of 79581561 is about 8920.8497913596. The cubic root of 79581561 is about 430.1343748054.

The spelling of 79581561 in words is "seventy-nine million, five hundred eighty-one thousand, five hundred sixty-one".