217131143 has 2 divisors, whose sum is σ = 217131144. Its totient is φ = 217131142.

The previous prime is 217131097. The next prime is 217131169. The reversal of 217131143 is 341131712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217131143 - 2⁸ = 217130887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217131443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108565571 + 108565572.

It is an arithmetic number, because the mean of its divisors is an integer number (108565572).

Almost surely, 2^217131143 is an apocalyptic number.

217131143 is a deficient number, since it is larger than the sum of its proper divisors (1).

217131143 is an equidigital number, since it uses as much as digits as its factorization.

217131143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 23.

The square root of 217131143 is about 14735.3704737954. The cubic root of 217131143 is about 601.0455316772.

Adding to 217131143 its reverse (341131712), we get a palindrome (558262855).

The spelling of 217131143 in words is "two hundred seventeen million, one hundred thirty-one thousand, one hundred forty-three".