800080009 has 2 divisors, whose sum is σ = 800080010. Its totient is φ = 800080008.

The previous prime is 800079979. The next prime is 800080019. The reversal of 800080009 is 900080008.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 433472400 + 366607609 = 20820^2 + 19147^2 .

It is a cyclic number.

It is not a de Polignac number, because 800080009 - 2⁷ = 800079881 is a prime.

It is not a weakly prime, because it can be changed into another prime (800080019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400040004 + 400040005.

It is an arithmetic number, because the mean of its divisors is an integer number (400040005).

Almost surely, 2^800080009 is an apocalyptic number.

It is an amenable number.

800080009 is a deficient number, since it is larger than the sum of its proper divisors (1).

800080009 is an equidigital number, since it uses as much as digits as its factorization.

800080009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 800080009 is about 28285.6855847618. The cubic root of 800080009 is about 928.3487130977.

Subtracting 800080009 from its reverse (900080008), we obtain a palindrome (99999999).

The spelling of 800080009 in words is "eight hundred million, eighty thousand, nine".