1215250217 has 2 divisors, whose sum is σ = 1215250218. Its totient is φ = 1215250216.

The previous prime is 1215250213. The next prime is 1215250259. The reversal of 1215250217 is 7120525121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1144874896 + 70375321 = 33836^2 + 8389^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215250217 - 2² = 1215250213 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215250213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607625108 + 607625109.

It is an arithmetic number, because the mean of its divisors is an integer number (607625109).

Almost surely, 2^1215250217 is an apocalyptic number.

It is an amenable number.

1215250217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215250217 is an equidigital number, since it uses as much as digits as its factorization.

1215250217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 1215250217 is about 34860.4391395174. The cubic root of 1215250217 is about 1067.1412369506.

Adding to 1215250217 its reverse (7120525121), we get a palindrome (8335775338).

The spelling of 1215250217 in words is "one billion, two hundred fifteen million, two hundred fifty thousand, two hundred seventeen".