80839921 has 4 divisors (see below), whose sum is σ = 81196272. Its totient is φ = 80483572.

The previous prime is 80839901. The next prime is 80839937. The reversal of 80839921 is 12993808.

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-80839921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80839901) 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, 177835 + ... + 178288.

It is an arithmetic number, because the mean of its divisors is an integer number (20299068).

Almost surely, 2^80839921 is an apocalyptic number.

It is an amenable number.

80839921 is a deficient number, since it is larger than the sum of its proper divisors (356351).

80839921 is a wasteful number, since it uses less digits than its factorization.

80839921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356350.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 80839921 is about 8991.1023239645. The cubic root of 80839921 is about 432.3896536515.

The spelling of 80839921 in words is "eighty million, eight hundred thirty-nine thousand, nine hundred twenty-one".