80881681 has 2 divisors, whose sum is σ = 80881682. Its totient is φ = 80881680.

The previous prime is 80881679. The next prime is 80881711. The reversal of 80881681 is 18618808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76720081 + 4161600 = 8759^2 + 2040^2 .

It is a cyclic number.

It is not a de Polignac number, because 80881681 - 2¹ = 80881679 is a prime.

It is a super-2 number, since 2×80881681² = 13083692642771522, which contains 22 as substring.

Together with 80881679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (80881781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40440840 + 40440841.

It is an arithmetic number, because the mean of its divisors is an integer number (40440841).

Almost surely, 2^80881681 is an apocalyptic number.

It is an amenable number.

80881681 is a deficient number, since it is larger than the sum of its proper divisors (1).

80881681 is an equidigital number, since it uses as much as digits as its factorization.

80881681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 40.

The square root of 80881681 is about 8993.4243200240. The cubic root of 80881681 is about 432.4640949400.

The spelling of 80881681 in words is "eighty million, eight hundred eighty-one thousand, six hundred eighty-one".