80611681 has 2 divisors, whose sum is σ = 80611682. Its totient is φ = 80611680.

The previous prime is 80611651. The next prime is 80611691. The reversal of 80611681 is 18611608.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51624225 + 28987456 = 7185^2 + 5384^2 .

It is a cyclic number.

It is not a de Polignac number, because 80611681 - 2¹⁹ = 80087393 is a prime.

It is a super-2 number, since 2×80611681² = 12996486227291522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (80611621) 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, 40305840 + 40305841.

It is an arithmetic number, because the mean of its divisors is an integer number (40305841).

Almost surely, 2^80611681 is an apocalyptic number.

It is an amenable number.

80611681 is a deficient number, since it is larger than the sum of its proper divisors (1).

80611681 is an equidigital number, since it uses as much as digits as its factorization.

80611681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 80611681 is about 8978.4008041522. The cubic root of 80611681 is about 431.9823398845.

The spelling of 80611681 in words is "eighty million, six hundred eleven thousand, six hundred eighty-one".