217630943 has 6 divisors (see below), whose sum is σ = 224878752. Its totient is φ = 210609660.

The previous prime is 217630937. The next prime is 217630949. The reversal of 217630943 is 349036712.

It is an interprime number because it is at equal distance from previous prime (217630937) and next prime (217630949).

It is not a de Polignac number, because 217630943 - 2⁴ = 217630927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217630949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112271 + ... + 114192.

It is an arithmetic number, because the mean of its divisors is an integer number (37479792).

Almost surely, 2^217630943 is an apocalyptic number.

217630943 is a deficient number, since it is larger than the sum of its proper divisors (7247809).

217630943 is an equidigital number, since it uses as much as digits as its factorization.

217630943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226525 (or 226494 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 217630943 is about 14752.3199192534. The cubic root of 217630943 is about 601.5063474382.

The spelling of 217630943 in words is "two hundred seventeen million, six hundred thirty thousand, nine hundred forty-three".