80858809 has 2 divisors, whose sum is σ = 80858810. Its totient is φ = 80858808.

The previous prime is 80858803. The next prime is 80858821. The reversal of 80858809 is 90885808.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80048809 + 810000 = 8947^2 + 900^2 .

It is a cyclic number.

It is not a de Polignac number, because 80858809 - 2¹⁷ = 80727737 is a prime.

It is not a weakly prime, because it can be changed into another prime (80858803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40429404 + 40429405.

It is an arithmetic number, because the mean of its divisors is an integer number (40429405).

Almost surely, 2^80858809 is an apocalyptic number.

It is an amenable number.

80858809 is a deficient number, since it is larger than the sum of its proper divisors (1).

80858809 is an equidigital number, since it uses as much as digits as its factorization.

80858809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 184320, while the sum is 46.

The square root of 80858809 is about 8992.1526343807. The cubic root of 80858809 is about 432.4233265353.

The spelling of 80858809 in words is "eighty million, eight hundred fifty-eight thousand, eight hundred nine".