80716521 has 4 divisors (see below), whose sum is σ = 107622032. Its totient is φ = 53811012.

The previous prime is 80716511. The next prime is 80716523. The reversal of 80716521 is 12561708.

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 not a de Polignac number, because 80716521 - 2⁷ = 80716393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80716523) 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, 13452751 + ... + 13452756.

It is an arithmetic number, because the mean of its divisors is an integer number (26905508).

Almost surely, 2^80716521 is an apocalyptic number.

It is an amenable number.

80716521 is a deficient number, since it is larger than the sum of its proper divisors (26905511).

80716521 is a wasteful number, since it uses less digits than its factorization.

80716521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26905510.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 80716521 is about 8984.2373632936. The cubic root of 80716521 is about 432.1695311554.

The spelling of 80716521 in words is "eighty million, seven hundred sixteen thousand, five hundred twenty-one".