80905221 has 6 divisors (see below), whose sum is σ = 116863110. Its totient is φ = 53936808.

The previous prime is 80905219. The next prime is 80905267. The reversal of 80905221 is 12250908.

It can be written as a sum of positive squares in only one way, i.e., 72437121 + 8468100 = 8511^2 + 2910^2 .

It is not a de Polignac number, because 80905221 - 2¹ = 80905219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80705221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4494726 + ... + 4494743.

It is an arithmetic number, because the mean of its divisors is an integer number (19477185).

Almost surely, 2^80905221 is an apocalyptic number.

It is an amenable number.

80905221 is a deficient number, since it is larger than the sum of its proper divisors (35957889).

80905221 is a wasteful number, since it uses less digits than its factorization.

80905221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8989475 (or 8989472 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 80905221 is about 8994.7329587932. The cubic root of 80905221 is about 432.5060460023.

The spelling of 80905221 in words is "eighty million, nine hundred five thousand, two hundred twenty-one".