219944489 has 2 divisors, whose sum is σ = 219944490. Its totient is φ = 219944488.

The previous prime is 219944479. The next prime is 219944563. The reversal of 219944489 is 984449912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196981225 + 22963264 = 14035^2 + 4792^2 .

It is a cyclic number.

It is not a de Polignac number, because 219944489 - 2¹² = 219940393 is a prime.

It is a super-2 number, since 2×219944489² = 96751156482942242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (219944429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109972244 + 109972245.

It is an arithmetic number, because the mean of its divisors is an integer number (109972245).

Almost surely, 2^219944489 is an apocalyptic number.

It is an amenable number.

219944489 is a deficient number, since it is larger than the sum of its proper divisors (1).

219944489 is an equidigital number, since it uses as much as digits as its factorization.

219944489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 50.

The square root of 219944489 is about 14830.5255807068. The cubic root of 219944489 is about 603.6302952570.

The spelling of 219944489 in words is "two hundred nineteen million, nine hundred forty-four thousand, four hundred eighty-nine".