80745809 has 2 divisors, whose sum is σ = 80745810. Its totient is φ = 80745808.

The previous prime is 80745781. The next prime is 80745827. The reversal of 80745809 is 90854708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78411025 + 2334784 = 8855^2 + 1528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80745809 is a prime.

It is not a weakly prime, because it can be changed into another prime (80741809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40372904 + 40372905.

It is an arithmetic number, because the mean of its divisors is an integer number (40372905).

Almost surely, 2^80745809 is an apocalyptic number.

It is an amenable number.

80745809 is a deficient number, since it is larger than the sum of its proper divisors (1).

80745809 is an equidigital number, since it uses as much as digits as its factorization.

80745809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 80745809 is about 8985.8671813020. The cubic root of 80745809 is about 432.2217957578.

The spelling of 80745809 in words is "eighty million, seven hundred forty-five thousand, eight hundred nine".