80536921 has 4 divisors (see below), whose sum is σ = 80561572. Its totient is φ = 80512272.

The previous prime is 80536913. The next prime is 80536927. The reversal of 80536921 is 12963508.

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 51322896 + 29214025 = 7164^2 + 5405^2 .

It is a cyclic number.

It is not a de Polignac number, because 80536921 - 2³ = 80536913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80536927) 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, 6510 + ... + 14263.

It is an arithmetic number, because the mean of its divisors is an integer number (20140393).

Almost surely, 2^80536921 is an apocalyptic number.

It is an amenable number.

80536921 is a deficient number, since it is larger than the sum of its proper divisors (24651).

80536921 is a wasteful number, since it uses less digits than its factorization.

80536921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24650.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 80536921 is about 8974.2365134868. The cubic root of 80536921 is about 431.8487571413.

The spelling of 80536921 in words is "eighty million, five hundred thirty-six thousand, nine hundred twenty-one".