80788909 has 2 divisors, whose sum is σ = 80788910. Its totient is φ = 80788908.

The previous prime is 80788889. The next prime is 80788933. The reversal of 80788909 is 90988708.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66748900 + 14040009 = 8170^2 + 3747^2 .

It is a cyclic number.

It is not a de Polignac number, because 80788909 - 2¹¹ = 80786861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80788979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40394454 + 40394455.

It is an arithmetic number, because the mean of its divisors is an integer number (40394455).

Almost surely, 2^80788909 is an apocalyptic number.

It is an amenable number.

80788909 is a deficient number, since it is larger than the sum of its proper divisors (1).

80788909 is an equidigital number, since it uses as much as digits as its factorization.

80788909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 49.

The square root of 80788909 is about 8988.2650717477. The cubic root of 80788909 is about 432.2986849738.

The spelling of 80788909 in words is "eighty million, seven hundred eighty-eight thousand, nine hundred nine".