216839479 has 2 divisors, whose sum is σ = 216839480. Its totient is φ = 216839478.

The previous prime is 216839449. The next prime is 216839489. The reversal of 216839479 is 974938612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216839479 - 2⁹ = 216838967 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216839449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108419739 + 108419740.

It is an arithmetic number, because the mean of its divisors is an integer number (108419740).

Almost surely, 2^216839479 is an apocalyptic number.

216839479 is a deficient number, since it is larger than the sum of its proper divisors (1).

216839479 is an equidigital number, since it uses as much as digits as its factorization.

216839479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 49.

The square root of 216839479 is about 14725.4704169341. The cubic root of 216839479 is about 600.7762905588.

The spelling of 216839479 in words is "two hundred sixteen million, eight hundred thirty-nine thousand, four hundred seventy-nine".