219816929 has 2 divisors, whose sum is σ = 219816930. Its totient is φ = 219816928.

The previous prime is 219816913. The next prime is 219816931. The reversal of 219816929 is 929618912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111344704 + 108472225 = 10552^2 + 10415^2 .

It is a cyclic number.

It is not a de Polignac number, because 219816929 - 2⁴ = 219816913 is a prime.

Together with 219816931, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (219816959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109908464 + 109908465.

It is an arithmetic number, because the mean of its divisors is an integer number (109908465).

Almost surely, 2^219816929 is an apocalyptic number.

It is an amenable number.

219816929 is a deficient number, since it is larger than the sum of its proper divisors (1).

219816929 is an equidigital number, since it uses as much as digits as its factorization.

219816929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 47.

The square root of 219816929 is about 14826.2243676534. The cubic root of 219816929 is about 603.5135779720.

The spelling of 219816929 in words is "two hundred nineteen million, eight hundred sixteen thousand, nine hundred twenty-nine".