216911939 has 2 divisors, whose sum is σ = 216911940. Its totient is φ = 216911938.

The previous prime is 216911927. The next prime is 216911969. The reversal of 216911939 is 939119612.

216911939 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 216911939 - 2⁸ = 216911683 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 216911896 and 216911905.

It is not a weakly prime, because it can be changed into another prime (216911969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108455969 + 108455970.

It is an arithmetic number, because the mean of its divisors is an integer number (108455970).

Almost surely, 2^216911939 is an apocalyptic number.

216911939 is a deficient number, since it is larger than the sum of its proper divisors (1).

216911939 is an equidigital number, since it uses as much as digits as its factorization.

216911939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 41.

The square root of 216911939 is about 14727.9305742524. The cubic root of 216911939 is about 600.8432024240.

The spelling of 216911939 in words is "two hundred sixteen million, nine hundred eleven thousand, nine hundred thirty-nine".