80715709 has 2 divisors, whose sum is σ = 80715710. Its totient is φ = 80715708.

The previous prime is 80715707. The next prime is 80715721. The reversal of 80715709 is 90751708.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78322500 + 2393209 = 8850^2 + 1547^2 .

It is a cyclic number.

It is not a de Polignac number, because 80715709 - 2¹ = 80715707 is a prime.

Together with 80715707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80715703) 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, 40357854 + 40357855.

It is an arithmetic number, because the mean of its divisors is an integer number (40357855).

Almost surely, 2^80715709 is an apocalyptic number.

It is an amenable number.

80715709 is a deficient number, since it is larger than the sum of its proper divisors (1).

80715709 is an equidigital number, since it uses as much as digits as its factorization.

80715709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 80715709 is about 8984.1921729224. The cubic root of 80715709 is about 432.1680819567.

The spelling of 80715709 in words is "eighty million, seven hundred fifteen thousand, seven hundred nine".