80813221 has 2 divisors, whose sum is σ = 80813222. Its totient is φ = 80813220.

The previous prime is 80813203. The next prime is 80813261. The reversal of 80813221 is 12231808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80748196 + 65025 = 8986^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 80813221 - 2⁷ = 80813093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80813261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40406610 + 40406611.

It is an arithmetic number, because the mean of its divisors is an integer number (40406611).

Almost surely, 2^80813221 is an apocalyptic number.

It is an amenable number.

80813221 is a deficient number, since it is larger than the sum of its proper divisors (1).

80813221 is an equidigital number, since it uses as much as digits as its factorization.

80813221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 80813221 is about 8989.6174000900. The cubic root of 80813221 is about 432.3420448511.

The spelling of 80813221 in words is "eighty million, eight hundred thirteen thousand, two hundred twenty-one".