215464217 has 2 divisors, whose sum is σ = 215464218. Its totient is φ = 215464216.

The previous prime is 215464169. The next prime is 215464243. The reversal of 215464217 is 712464512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183439936 + 32024281 = 13544^2 + 5659^2 .

It is a cyclic number.

It is not a de Polignac number, because 215464217 - 2¹² = 215460121 is a prime.

It is not a weakly prime, because it can be changed into another prime (215464297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107732108 + 107732109.

It is an arithmetic number, because the mean of its divisors is an integer number (107732109).

Almost surely, 2^215464217 is an apocalyptic number.

It is an amenable number.

215464217 is a deficient number, since it is larger than the sum of its proper divisors (1).

215464217 is an equidigital number, since it uses as much as digits as its factorization.

215464217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 32.

The square root of 215464217 is about 14678.6994314892. The cubic root of 215464217 is about 599.5034938791.

The spelling of 215464217 in words is "two hundred fifteen million, four hundred sixty-four thousand, two hundred seventeen".