80657281 has 2 divisors, whose sum is σ = 80657282. Its totient is φ = 80657280.

The previous prime is 80657279. The next prime is 80657303. The reversal of 80657281 is 18275608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70829056 + 9828225 = 8416^2 + 3135^2 .

It is a cyclic number.

It is not a de Polignac number, because 80657281 - 2¹ = 80657279 is a prime.

It is a super-2 number, since 2×80657281² = 13011193956625922, which contains 22 as substring.

Together with 80657279, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 80657281.

It is not a weakly prime, because it can be changed into another prime (80657201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40328640 + 40328641.

It is an arithmetic number, because the mean of its divisors is an integer number (40328641).

Almost surely, 2^80657281 is an apocalyptic number.

It is an amenable number.

80657281 is a deficient number, since it is larger than the sum of its proper divisors (1).

80657281 is an equidigital number, since it uses as much as digits as its factorization.

80657281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 80657281 is about 8980.9398728641. The cubic root of 80657281 is about 432.0637783780.

The spelling of 80657281 in words is "eighty million, six hundred fifty-seven thousand, two hundred eighty-one".