80556209 has 2 divisors, whose sum is σ = 80556210. Its totient is φ = 80556208.

The previous prime is 80556163. The next prime is 80556211. The reversal of 80556209 is 90265508.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40360609 + 40195600 = 6353^2 + 6340^2 .

It is a cyclic number.

It is not a de Polignac number, because 80556209 - 2¹⁶ = 80490673 is a prime.

Together with 80556211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80556709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40278104 + 40278105.

It is an arithmetic number, because the mean of its divisors is an integer number (40278105).

Almost surely, 2^80556209 is an apocalyptic number.

It is an amenable number.

80556209 is a deficient number, since it is larger than the sum of its proper divisors (1).

80556209 is an equidigital number, since it uses as much as digits as its factorization.

80556209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 80556209 is about 8975.3110809598. The cubic root of 80556209 is about 431.8832292562.

The spelling of 80556209 in words is "eighty million, five hundred fifty-six thousand, two hundred nine".