36561209 has 2 divisors, whose sum is σ = 36561210. Its totient is φ = 36561208.

The previous prime is 36561197. The next prime is 36561227. The reversal of 36561209 is 90216563.

It is a happy number.

36561209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21715600 + 14845609 = 4660^2 + 3853^2 .

It is a cyclic number.

It is not a de Polignac number, because 36561209 - 2⁴ = 36561193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (36561229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18280604 + 18280605.

It is an arithmetic number, because the mean of its divisors is an integer number (18280605).

Almost surely, 2^36561209 is an apocalyptic number.

It is an amenable number.

36561209 is a deficient number, since it is larger than the sum of its proper divisors (1).

36561209 is an equidigital number, since it uses as much as digits as its factorization.

36561209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 36561209 is about 6046.5865577200. The cubic root of 36561209 is about 331.8996920803.

The spelling of 36561209 in words is "thirty-six million, five hundred sixty-one thousand, two hundred nine".