80961761 has 2 divisors, whose sum is σ = 80961762. Its totient is φ = 80961760.

The previous prime is 80961743. The next prime is 80961833. The reversal of 80961761 is 16716908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71233600 + 9728161 = 8440^2 + 3119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80961761 is a prime.

It is a super-2 number, since 2×80961761² = 13109613488442242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80961721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40480880 + 40480881.

It is an arithmetic number, because the mean of its divisors is an integer number (40480881).

Almost surely, 2^80961761 is an apocalyptic number.

It is an amenable number.

80961761 is a deficient number, since it is larger than the sum of its proper divisors (1).

80961761 is an equidigital number, since it uses as much as digits as its factorization.

80961761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 80961761 is about 8997.8753603281. The cubic root of 80961761 is about 432.6067737315.

The spelling of 80961761 in words is "eighty million, nine hundred sixty-one thousand, seven hundred sixty-one".