79547561 has 4 divisors (see below), whose sum is σ = 79612500. Its totient is φ = 79482624.

The previous prime is 79547557. The next prime is 79547603. The reversal of 79547561 is 16574597.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37699600 + 41847961 = 6140^2 + 6469^2 .

It is a cyclic number.

It is not a de Polignac number, because 79547561 - 2² = 79547557 is a prime.

It is a super-2 number, since 2×79547561² = 12655628922097442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79547161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30596 + ... + 33093.

It is an arithmetic number, because the mean of its divisors is an integer number (19903125).

Almost surely, 2^79547561 is an apocalyptic number.

It is an amenable number.

79547561 is a deficient number, since it is larger than the sum of its proper divisors (64939).

79547561 is a wasteful number, since it uses less digits than its factorization.

79547561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64938.

The product of its digits is 264600, while the sum is 44.

The square root of 79547561 is about 8918.9439397274. The cubic root of 79547561 is about 430.0731099774.

It can be divided in two parts, 79547 and 561, that added together give a palindrome (80108).

The spelling of 79547561 in words is "seventy-nine million, five hundred forty-seven thousand, five hundred sixty-one".