80205509 has 2 divisors, whose sum is σ = 80205510. Its totient is φ = 80205508.

The previous prime is 80205493. The next prime is 80205551. The reversal of 80205509 is 90550208.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69772609 + 10432900 = 8353^2 + 3230^2 .

It is a cyclic number.

It is not a de Polignac number, because 80205509 - 2⁴ = 80205493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80205569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40102754 + 40102755.

It is an arithmetic number, because the mean of its divisors is an integer number (40102755).

Almost surely, 2^80205509 is an apocalyptic number.

It is an amenable number.

80205509 is a deficient number, since it is larger than the sum of its proper divisors (1).

80205509 is an equidigital number, since it uses as much as digits as its factorization.

80205509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 80205509 is about 8955.7528438429. The cubic root of 80205509 is about 431.2555856169.

The spelling of 80205509 in words is "eighty million, two hundred five thousand, five hundred nine".