80659729 has 2 divisors, whose sum is σ = 80659730. Its totient is φ = 80659728.

The previous prime is 80659619. The next prime is 80659753. The reversal of 80659729 is 92795608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60093504 + 20566225 = 7752^2 + 4535^2 .

It is a cyclic number.

It is not a de Polignac number, because 80659729 - 2¹⁹ = 80135441 is a prime.

It is not a weakly prime, because it can be changed into another prime (80659829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40329864 + 40329865.

It is an arithmetic number, because the mean of its divisors is an integer number (40329865).

Almost surely, 2^80659729 is an apocalyptic number.

It is an amenable number.

80659729 is a deficient number, since it is larger than the sum of its proper divisors (1).

80659729 is an equidigital number, since it uses as much as digits as its factorization.

80659729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 80659729 is about 8981.0761604610. The cubic root of 80659729 is about 432.0681494710.

The spelling of 80659729 in words is "eighty million, six hundred fifty-nine thousand, seven hundred twenty-nine".