612420209 has 2 divisors, whose sum is σ = 612420210. Its totient is φ = 612420208.

The previous prime is 612420203. The next prime is 612420251. The reversal of 612420209 is 902024216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 567154225 + 45265984 = 23815^2 + 6728^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-612420209 is a prime.

It is not a weakly prime, because it can be changed into another prime (612420203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306210104 + 306210105.

It is an arithmetic number, because the mean of its divisors is an integer number (306210105).

Almost surely, 2^612420209 is an apocalyptic number.

It is an amenable number.

612420209 is a deficient number, since it is larger than the sum of its proper divisors (1).

612420209 is an equidigital number, since it uses as much as digits as its factorization.

612420209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 612420209 is about 24747.1252673922. The cubic root of 612420209 is about 849.2127469810.

The spelling of 612420209 in words is "six hundred twelve million, four hundred twenty thousand, two hundred nine".