80815913 has 2 divisors, whose sum is σ = 80815914. Its totient is φ = 80815912.

The previous prime is 80815897. The next prime is 80815919. The reversal of 80815913 is 31951808.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74425129 + 6390784 = 8627^2 + 2528^2 .

It is a cyclic number.

It is not a de Polignac number, because 80815913 - 2⁴ = 80815897 is a prime.

It is not a weakly prime, because it can be changed into another prime (80815919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40407956 + 40407957.

It is an arithmetic number, because the mean of its divisors is an integer number (40407957).

Almost surely, 2^80815913 is an apocalyptic number.

It is an amenable number.

80815913 is a deficient number, since it is larger than the sum of its proper divisors (1).

80815913 is an equidigital number, since it uses as much as digits as its factorization.

80815913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 80815913 is about 8989.7671271285. The cubic root of 80815913 is about 432.3468454347.

The spelling of 80815913 in words is "eighty million, eight hundred fifteen thousand, nine hundred thirteen".