80711681 has 2 divisors, whose sum is σ = 80711682. Its totient is φ = 80711680.

The previous prime is 80711641. The next prime is 80711707. The reversal of 80711681 is 18611708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54538225 + 26173456 = 7385^2 + 5116^2 .

It is a cyclic number.

It is not a de Polignac number, because 80711681 - 2¹⁴ = 80695297 is a prime.

It is a super-2 number, since 2×80711681² = 13028750899691522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80711641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40355840 + 40355841.

It is an arithmetic number, because the mean of its divisors is an integer number (40355841).

Almost surely, 2^80711681 is an apocalyptic number.

It is an amenable number.

80711681 is a deficient number, since it is larger than the sum of its proper divisors (1).

80711681 is an equidigital number, since it uses as much as digits as its factorization.

80711681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 32.

The square root of 80711681 is about 8983.9679986073. The cubic root of 80711681 is about 432.1608929307.

The spelling of 80711681 in words is "eighty million, seven hundred eleven thousand, six hundred eighty-one".