79803561 has 16 divisors (see below), whose sum is σ = 109560384. Its totient is φ = 51632064.

The previous prime is 79803551. The next prime is 79803599. The reversal of 79803561 is 16530897.

It is not a de Polignac number, because 79803561 - 2¹⁰ = 79802537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79803511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61855 + ... + 63131.

It is an arithmetic number, because the mean of its divisors is an integer number (6847524).

Almost surely, 2^79803561 is an apocalyptic number.

It is an amenable number.

79803561 is a deficient number, since it is larger than the sum of its proper divisors (29756823).

79803561 is a wasteful number, since it uses less digits than its factorization.

79803561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 79803561 is about 8933.2838866791. The cubic root of 79803561 is about 430.5339697821.

The spelling of 79803561 in words is "seventy-nine million, eight hundred three thousand, five hundred sixty-one".