80357681 has 2 divisors, whose sum is σ = 80357682. Its totient is φ = 80357680.

The previous prime is 80357677. The next prime is 80357687. The reversal of 80357681 is 18675308.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75968656 + 4389025 = 8716^2 + 2095^2 .

It is a cyclic number.

It is not a de Polignac number, because 80357681 - 2² = 80357677 is a prime.

It is a super-2 number, since 2×80357681² = 12914713791395522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (80357687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40178840 + 40178841.

It is an arithmetic number, because the mean of its divisors is an integer number (40178841).

Almost surely, 2^80357681 is an apocalyptic number.

It is an amenable number.

80357681 is a deficient number, since it is larger than the sum of its proper divisors (1).

80357681 is an equidigital number, since it uses as much as digits as its factorization.

80357681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 80357681 is about 8964.2445861322. The cubic root of 80357681 is about 431.5281502930.

The spelling of 80357681 in words is "eighty million, three hundred fifty-seven thousand, six hundred eighty-one".