217273117 has 2 divisors, whose sum is σ = 217273118. Its totient is φ = 217273116.

The previous prime is 217273103. The next prime is 217273127. The reversal of 217273117 is 711372712.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189172516 + 28100601 = 13754^2 + 5301^2 .

It is a cyclic number.

It is not a de Polignac number, because 217273117 - 2¹¹ = 217271069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217273127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108636558 + 108636559.

It is an arithmetic number, because the mean of its divisors is an integer number (108636559).

Almost surely, 2^217273117 is an apocalyptic number.

It is an amenable number.

217273117 is a deficient number, since it is larger than the sum of its proper divisors (1).

217273117 is an equidigital number, since it uses as much as digits as its factorization.

217273117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4116, while the sum is 31.

The square root of 217273117 is about 14740.1871426383. The cubic root of 217273117 is about 601.1765035947.

The spelling of 217273117 in words is "two hundred seventeen million, two hundred seventy-three thousand, one hundred seventeen".