80981281 has 2 divisors, whose sum is σ = 80981282. Its totient is φ = 80981280.

The previous prime is 80981279. The next prime is 80981291. The reversal of 80981281 is 18218908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80013025 + 968256 = 8945^2 + 984^2 .

It is a cyclic number.

It is not a de Polignac number, because 80981281 - 2¹ = 80981279 is a prime.

It is a super-2 number, since 2×80981281² = 13115935744801922, which contains 22 as substring.

Together with 80981279, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80981281.

It is not a weakly prime, because it can be changed into another prime (80981291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40490640 + 40490641.

It is an arithmetic number, because the mean of its divisors is an integer number (40490641).

Almost surely, 2^80981281 is an apocalyptic number.

It is an amenable number.

80981281 is a deficient number, since it is larger than the sum of its proper divisors (1).

80981281 is an equidigital number, since it uses as much as digits as its factorization.

80981281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 80981281 is about 8998.9599954661. The cubic root of 80981281 is about 432.6415383149.

The spelling of 80981281 in words is "eighty million, nine hundred eighty-one thousand, two hundred eighty-one".