80803561 has 4 divisors (see below), whose sum is σ = 85056400. Its totient is φ = 76550724.

The previous prime is 80803549. The next prime is 80803631. The reversal of 80803561 is 16530808.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80803561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80804561) 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, 2126391 + ... + 2126428.

It is an arithmetic number, because the mean of its divisors is an integer number (21264100).

Almost surely, 2^80803561 is an apocalyptic number.

It is an amenable number.

80803561 is a deficient number, since it is larger than the sum of its proper divisors (4252839).

80803561 is a wasteful number, since it uses less digits than its factorization.

80803561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4252838.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 80803561 is about 8989.0800975406. The cubic root of 80803561 is about 432.3248175108.

The spelling of 80803561 in words is "eighty million, eight hundred three thousand, five hundred sixty-one".