80521 has 4 divisors (see below), whose sum is σ = 92032. Its totient is φ = 69012.

The previous prime is 80513. The next prime is 80527. The reversal of 80521 is 12508.

It is a happy number.

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 80521 - 2³ = 80513 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 80495 and 80504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80527) 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, 5745 + ... + 5758.

It is an arithmetic number, because the mean of its divisors is an integer number (23008).

2⁸⁰⁵²¹ is an apocalyptic number.

It is an amenable number.

80521 is a deficient number, since it is larger than the sum of its proper divisors (11511).

80521 is a wasteful number, since it uses less digits than its factorization.

80521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11510.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 80521 is about 283.7622244063. The cubic root of 80521 is about 43.1820298487.

Adding to 80521 its product of nonzero digits (80), we get a triangular number (80601 = T₄₀₁).

The spelling of 80521 in words is "eighty thousand, five hundred twenty-one".