217968503 has 2 divisors, whose sum is σ = 217968504. Its totient is φ = 217968502.

The previous prime is 217968473. The next prime is 217968521. The reversal of 217968503 is 305869712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217968503 is a prime.

It is a super-2 number, since 2×217968503² = 95020536600122018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217968103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108984251 + 108984252.

It is an arithmetic number, because the mean of its divisors is an integer number (108984252).

Almost surely, 2^217968503 is an apocalyptic number.

217968503 is a deficient number, since it is larger than the sum of its proper divisors (1).

217968503 is an equidigital number, since it uses as much as digits as its factorization.

217968503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 217968503 is about 14763.7563986947. The cubic root of 217968503 is about 601.8171788420.

The spelling of 217968503 in words is "two hundred seventeen million, nine hundred sixty-eight thousand, five hundred three".