80221581 has 12 divisors (see below), whose sum is σ = 126409920. Its totient is φ = 48619080.

The previous prime is 80221571. The next prime is 80221597. The reversal of 80221581 is 18512208.

80221581 is a `hidden beast` number, since 80 + 2 + 2 + 1 + 581 = 666.

It is not a de Polignac number, because 80221581 - 2⁵ = 80221549 is a prime.

It is a super-2 number, since 2×80221581² = 12871004116279122, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80221571) 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 11 ways as a sum of consecutive naturals, for example, 405061 + ... + 405258.

It is an arithmetic number, because the mean of its divisors is an integer number (10534160).

Almost surely, 2^80221581 is an apocalyptic number.

It is an amenable number.

80221581 is a deficient number, since it is larger than the sum of its proper divisors (46188339).

80221581 is a wasteful number, since it uses less digits than its factorization.

80221581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810336 (or 810333 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 80221581 is about 8956.6500992279. The cubic root of 80221581 is about 431.2843894441.

Adding to 80221581 its reverse (18512208), we get a palindrome (98733789).

The spelling of 80221581 in words is "eighty million, two hundred twenty-one thousand, five hundred eighty-one".