216550123 has 2 divisors, whose sum is σ = 216550124. Its totient is φ = 216550122.

The previous prime is 216550109. The next prime is 216550127. The reversal of 216550123 is 321055612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216550123 - 2⁵ = 216550091 is a prime.

It is not a weakly prime, because it can be changed into another prime (216550127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108275061 + 108275062.

It is an arithmetic number, because the mean of its divisors is an integer number (108275062).

Almost surely, 2^216550123 is an apocalyptic number.

216550123 is a deficient number, since it is larger than the sum of its proper divisors (1).

216550123 is an equidigital number, since it uses as much as digits as its factorization.

216550123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 216550123 is about 14715.6421198669. The cubic root of 216550123 is about 600.5089413240.

The spelling of 216550123 in words is "two hundred sixteen million, five hundred fifty thousand, one hundred twenty-three".