612543209 has 2 divisors, whose sum is σ = 612543210. Its totient is φ = 612543208.

The previous prime is 612543143. The next prime is 612543227. The reversal of 612543209 is 902345216.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 400200025 + 212343184 = 20005^2 + 14572^2 .

It is a cyclic number.

It is not a de Polignac number, because 612543209 - 2²⁴ = 595765993 is a prime.

It is not a weakly prime, because it can be changed into another prime (612543259) 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, 306271604 + 306271605.

It is an arithmetic number, because the mean of its divisors is an integer number (306271605).

Almost surely, 2^612543209 is an apocalyptic number.

It is an amenable number.

612543209 is a deficient number, since it is larger than the sum of its proper divisors (1).

612543209 is an equidigital number, since it uses as much as digits as its factorization.

612543209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 612543209 is about 24749.6102797600. The cubic root of 612543209 is about 849.2695958429.

The spelling of 612543209 in words is "six hundred twelve million, five hundred forty-three thousand, two hundred nine".