80971521 has 16 divisors (see below), whose sum is σ = 114484800. Its totient is φ = 50761728.

The previous prime is 80971519. The next prime is 80971529. The reversal of 80971521 is 12517908.

It is not a de Polignac number, because 80971521 - 2¹ = 80971519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80971529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2625 + ... + 12993.

It is an arithmetic number, because the mean of its divisors is an integer number (7155300).

Almost surely, 2^80971521 is an apocalyptic number.

It is an amenable number.

80971521 is a deficient number, since it is larger than the sum of its proper divisors (33513279).

80971521 is a wasteful number, since it uses less digits than its factorization.

80971521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10528.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 80971521 is about 8998.4176942394. The cubic root of 80971521 is about 432.6241567216.

The spelling of 80971521 in words is "eighty million, nine hundred seventy-one thousand, five hundred twenty-one".