216917623 has 16 divisors (see below), whose sum is σ = 256596480. Its totient is φ = 181440864.

The previous prime is 216917611. The next prime is 216917663. The reversal of 216917623 is 326719612.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216917623 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 (216917663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13411 + ... + 24772.

It is an arithmetic number, because the mean of its divisors is an integer number (16037280).

Almost surely, 2^216917623 is an apocalyptic number.

216917623 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

216917623 is a deficient number, since it is larger than the sum of its proper divisors (39678857).

216917623 is a wasteful number, since it uses less digits than its factorization.

216917623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38238.

The product of its digits is 27216, while the sum is 37.

The square root of 216917623 is about 14728.1235396774. The cubic root of 216917623 is about 600.8484505798.

The spelling of 216917623 in words is "two hundred sixteen million, nine hundred seventeen thousand, six hundred twenty-three".