216629879 has 2 divisors, whose sum is σ = 216629880. Its totient is φ = 216629878.

The previous prime is 216629851. The next prime is 216629899. The reversal of 216629879 is 978926612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216629879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216629899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108314939 + 108314940.

It is an arithmetic number, because the mean of its divisors is an integer number (108314940).

Almost surely, 2^216629879 is an apocalyptic number.

216629879 is a deficient number, since it is larger than the sum of its proper divisors (1).

216629879 is an equidigital number, since it uses as much as digits as its factorization.

216629879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 50.

The square root of 216629879 is about 14718.3517759293. The cubic root of 216629879 is about 600.5826553011.

The spelling of 216629879 in words is "two hundred sixteen million, six hundred twenty-nine thousand, eight hundred seventy-nine".