80108561 has 4 divisors (see below), whose sum is σ = 86270772. Its totient is φ = 73946352.

The previous prime is 80108549. The next prime is 80108591. The reversal of 80108561 is 16580108.

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 25806400 + 54302161 = 5080^2 + 7369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80108561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80108531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3081086 + ... + 3081111.

It is an arithmetic number, because the mean of its divisors is an integer number (21567693).

Almost surely, 2^80108561 is an apocalyptic number.

It is an amenable number.

80108561 is a deficient number, since it is larger than the sum of its proper divisors (6162211).

80108561 is a wasteful number, since it uses less digits than its factorization.

80108561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6162210.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 80108561 is about 8950.3385969470. The cubic root of 80108561 is about 431.0817562297.

Adding to 80108561 its reverse (16580108), we get a palindrome (96688669).

The spelling of 80108561 in words is "eighty million, one hundred eight thousand, five hundred sixty-one".