216917023 has 2 divisors, whose sum is σ = 216917024. Its totient is φ = 216917022.

The previous prime is 216917021. The next prime is 216917039. The reversal of 216917023 is 320719612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216917023 - 2¹ = 216917021 is a prime.

Together with 216917021, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216917021) 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 as a sum of consecutive naturals, namely, 108458511 + 108458512.

It is an arithmetic number, because the mean of its divisors is an integer number (108458512).

Almost surely, 2^216917023 is an apocalyptic number.

216917023 is a deficient number, since it is larger than the sum of its proper divisors (1).

216917023 is an equidigital number, since it uses as much as digits as its factorization.

216917023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 216917023 is about 14728.1031704697. The cubic root of 216917023 is about 600.8478965916.

The spelling of 216917023 in words is "two hundred sixteen million, nine hundred seventeen thousand, twenty-three".