219664441 has 2 divisors, whose sum is σ = 219664442. Its totient is φ = 219664440.

The previous prime is 219664427. The next prime is 219664447. The reversal of 219664441 is 144466912.

219664441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219632400 + 32041 = 14820^2 + 179^2 .

It is a cyclic number.

It is not a de Polignac number, because 219664441 - 2⁵ = 219664409 is a prime.

It is a super-3 number, since 3×219664441³ (a number of 26 digits) contains 333 as substring.

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 219664441.

It is not a weakly prime, because it can be changed into another prime (219664447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109832220 + 109832221.

It is an arithmetic number, because the mean of its divisors is an integer number (109832221).

Almost surely, 2^219664441 is an apocalyptic number.

It is an amenable number.

219664441 is a deficient number, since it is larger than the sum of its proper divisors (1).

219664441 is an equidigital number, since it uses as much as digits as its factorization.

219664441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 37.

The square root of 219664441 is about 14821.0809659755. The cubic root of 219664441 is about 603.3739923218.

The spelling of 219664441 in words is "two hundred nineteen million, six hundred sixty-four thousand, four hundred forty-one".