216517123 has 2 divisors, whose sum is σ = 216517124. Its totient is φ = 216517122.

The previous prime is 216517111. The next prime is 216517159. The reversal of 216517123 is 321715612.

It is a happy number.

216517123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216517123 - 2²¹ = 214419971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216517091 and 216517100.

It is not a weakly prime, because it can be changed into another prime (216517163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108258561 + 108258562.

It is an arithmetic number, because the mean of its divisors is an integer number (108258562).

Almost surely, 2^216517123 is an apocalyptic number.

216517123 is a deficient number, since it is larger than the sum of its proper divisors (1).

216517123 is an equidigital number, since it uses as much as digits as its factorization.

216517123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 216517123 is about 14714.5208212840. The cubic root of 216517123 is about 600.4784359895.

The spelling of 216517123 in words is "two hundred sixteen million, five hundred seventeen thousand, one hundred twenty-three".