80681 has 2 divisors, whose sum is σ = 80682. Its totient is φ = 80680.

The previous prime is 80677. The next prime is 80683. The reversal of 80681 is 18608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80656 + 25 = 284^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 80681 - 2² = 80677 is a prime.

It is a super-2 number, since 2×80681² = 13018847522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 80683, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 80681.

It is not a weakly prime, because it can be changed into another prime (80683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40340 + 40341.

It is an arithmetic number, because the mean of its divisors is an integer number (40341).

2⁸⁰⁶⁸¹ is an apocalyptic number.

It is an amenable number.

80681 is a deficient number, since it is larger than the sum of its proper divisors (1).

80681 is an equidigital number, since it uses as much as digits as its factorization.

80681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 80681 is about 284.0440106744. The cubic root of 80681 is about 43.2106126761.

The spelling of 80681 in words is "eighty thousand, six hundred eighty-one".