217475213 has 2 divisors, whose sum is σ = 217475214. Its totient is φ = 217475212.

The previous prime is 217475177. The next prime is 217475227. The reversal of 217475213 is 312574712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214388164 + 3087049 = 14642^2 + 1757^2 .

It is a cyclic number.

It is not a de Polignac number, because 217475213 - 2¹⁰ = 217474189 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 217475213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217475243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108737606 + 108737607.

It is an arithmetic number, because the mean of its divisors is an integer number (108737607).

Almost surely, 2^217475213 is an apocalyptic number.

It is an amenable number.

217475213 is a deficient number, since it is larger than the sum of its proper divisors (1).

217475213 is an equidigital number, since it uses as much as digits as its factorization.

217475213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 32.

The square root of 217475213 is about 14747.0408218056. The cubic root of 217475213 is about 601.3628400641.

The spelling of 217475213 in words is "two hundred seventeen million, four hundred seventy-five thousand, two hundred thirteen".