1214817217 has 2 divisors, whose sum is σ = 1214817218. Its totient is φ = 1214817216.

The previous prime is 1214817199. The next prime is 1214817239. The reversal of 1214817217 is 7127184121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1186044721 + 28772496 = 34439^2 + 5364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1214817217 - 2¹⁹ = 1214292929 is a prime.

It is not a weakly prime, because it can be changed into another prime (1214817277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607408608 + 607408609.

It is an arithmetic number, because the mean of its divisors is an integer number (607408609).

Almost surely, 2^1214817217 is an apocalyptic number.

It is an amenable number.

1214817217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1214817217 is an equidigital number, since it uses as much as digits as its factorization.

1214817217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6272, while the sum is 34.

The square root of 1214817217 is about 34854.2281079355. The cubic root of 1214817217 is about 1067.0144792290.

The spelling of 1214817217 in words is "one billion, two hundred fourteen million, eight hundred seventeen thousand, two hundred seventeen".