217238543 has 2 divisors, whose sum is σ = 217238544. Its totient is φ = 217238542.

The previous prime is 217238521. The next prime is 217238551. The reversal of 217238543 is 345832712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217238543 - 2¹⁶ = 217173007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217238143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108619271 + 108619272.

It is an arithmetic number, because the mean of its divisors is an integer number (108619272).

Almost surely, 2^217238543 is an apocalyptic number.

217238543 is a deficient number, since it is larger than the sum of its proper divisors (1).

217238543 is an equidigital number, since it uses as much as digits as its factorization.

217238543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 35.

The square root of 217238543 is about 14739.0143157540. The cubic root of 217238543 is about 601.1446141164.

The spelling of 217238543 in words is "two hundred seventeen million, two hundred thirty-eight thousand, five hundred forty-three".