80039809 has 2 divisors, whose sum is σ = 80039810. Its totient is φ = 80039808.

The previous prime is 80039807. The next prime is 80039819. The reversal of 80039809 is 90893008.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79709184 + 330625 = 8928^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 80039809 - 2¹ = 80039807 is a prime.

Together with 80039807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (80039801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40019904 + 40019905.

It is an arithmetic number, because the mean of its divisors is an integer number (40019905).

Almost surely, 2^80039809 is an apocalyptic number.

It is an amenable number.

80039809 is a deficient number, since it is larger than the sum of its proper divisors (1).

80039809 is an equidigital number, since it uses as much as digits as its factorization.

80039809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 80039809 is about 8946.4970239754. The cubic root of 80039809 is about 430.9583977301.

The spelling of 80039809 in words is "eighty million, thirty-nine thousand, eight hundred nine".