80801921 has 4 divisors (see below), whose sum is σ = 84315072. Its totient is φ = 77288772.

The previous prime is 80801891. The next prime is 80801947. The reversal of 80801921 is 12910808.

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 not a de Polignac number, because 80801921 - 2¹⁰ = 80800897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80801971) 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, 1756541 + ... + 1756586.

It is an arithmetic number, because the mean of its divisors is an integer number (21078768).

Almost surely, 2^80801921 is an apocalyptic number.

It is an amenable number.

80801921 is a deficient number, since it is larger than the sum of its proper divisors (3513151).

80801921 is a wasteful number, since it uses less digits than its factorization.

80801921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3513150.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 80801921 is about 8988.9888752851. The cubic root of 80801921 is about 432.3218926500.

It can be divided in two parts, 8080 and 1921, that added together give a palindrome (10001).

The spelling of 80801921 in words is "eighty million, eight hundred one thousand, nine hundred twenty-one".