80715517 has 2 divisors, whose sum is σ = 80715518. Its totient is φ = 80715516.

The previous prime is 80715499. The next prime is 80715529. The reversal of 80715517 is 71551708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78659161 + 2056356 = 8869^2 + 1434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80715517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80715617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40357758 + 40357759.

It is an arithmetic number, because the mean of its divisors is an integer number (40357759).

Almost surely, 2^80715517 is an apocalyptic number.

It is an amenable number.

80715517 is a deficient number, since it is larger than the sum of its proper divisors (1).

80715517 is an equidigital number, since it uses as much as digits as its factorization.

80715517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9800, while the sum is 34.

The square root of 80715517 is about 8984.1814874812. The cubic root of 80715517 is about 432.1677392876.

The spelling of 80715517 in words is "eighty million, seven hundred fifteen thousand, five hundred seventeen".