1205107217 has 2 divisors, whose sum is σ = 1205107218. Its totient is φ = 1205107216.

The previous prime is 1205107199. The next prime is 1205107223. The reversal of 1205107217 is 7127015021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 971506561 + 233600656 = 31169^2 + 15284^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205107217 - 2⁸ = 1205106961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1205107417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602553608 + 602553609.

It is an arithmetic number, because the mean of its divisors is an integer number (602553609).

Almost surely, 2^1205107217 is an apocalyptic number.

It is an amenable number.

1205107217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205107217 is an equidigital number, since it uses as much as digits as its factorization.

1205107217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 1205107217 is about 34714.6542111541. The cubic root of 1205107217 is about 1064.1639987966.

The spelling of 1205107217 in words is "one billion, two hundred five million, one hundred seven thousand, two hundred seventeen".