612208217 has 2 divisors, whose sum is σ = 612208218. Its totient is φ = 612208216.

The previous prime is 612208171. The next prime is 612208313. The reversal of 612208217 is 712802216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 612018121 + 190096 = 24739^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 612208217 - 2²⁸ = 343772761 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 612208217.

It is not a weakly prime, because it can be changed into another prime (612204217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306104108 + 306104109.

It is an arithmetic number, because the mean of its divisors is an integer number (306104109).

Almost surely, 2^612208217 is an apocalyptic number.

It is an amenable number.

612208217 is a deficient number, since it is larger than the sum of its proper divisors (1).

612208217 is an equidigital number, since it uses as much as digits as its factorization.

612208217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 612208217 is about 24742.8417325092. The cubic root of 612208217 is about 849.1147494066.

The spelling of 612208217 in words is "six hundred twelve million, two hundred eight thousand, two hundred seventeen".