216776123 has 2 divisors, whose sum is σ = 216776124. Its totient is φ = 216776122.

The previous prime is 216776113. The next prime is 216776141. The reversal of 216776123 is 321677612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216776123 - 2²⁴ = 199998907 is a prime.

It is a super-2 number, since 2×216776123² = 93983775005822258, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (216776113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108388061 + 108388062.

It is an arithmetic number, because the mean of its divisors is an integer number (108388062).

Almost surely, 2^216776123 is an apocalyptic number.

216776123 is a deficient number, since it is larger than the sum of its proper divisors (1).

216776123 is an equidigital number, since it uses as much as digits as its factorization.

216776123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 35.

The square root of 216776123 is about 14723.3190211990. The cubic root of 216776123 is about 600.7177734006.

The spelling of 216776123 in words is "two hundred sixteen million, seven hundred seventy-six thousand, one hundred twenty-three".