216528839 has 2 divisors, whose sum is σ = 216528840. Its totient is φ = 216528838.

The previous prime is 216528817. The next prime is 216528841. The reversal of 216528839 is 938825612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216528839 - 2¹² = 216524743 is a prime.

Together with 216528841, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216528839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216528139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108264419 + 108264420.

It is an arithmetic number, because the mean of its divisors is an integer number (108264420).

Almost surely, 2^216528839 is an apocalyptic number.

216528839 is a deficient number, since it is larger than the sum of its proper divisors (1).

216528839 is an equidigital number, since it uses as much as digits as its factorization.

216528839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The square root of 216528839 is about 14714.9189260424. The cubic root of 216528839 is about 600.4892666625.

The spelling of 216528839 in words is "two hundred sixteen million, five hundred twenty-eight thousand, eight hundred thirty-nine".