219421589 has 2 divisors, whose sum is σ = 219421590. Its totient is φ = 219421588.

The previous prime is 219421577. The next prime is 219421603. The reversal of 219421589 is 985124912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201924100 + 17497489 = 14210^2 + 4183^2 .

It is a cyclic number.

It is not a de Polignac number, because 219421589 - 2²⁰ = 218373013 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219421549) 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, 109710794 + 109710795.

It is an arithmetic number, because the mean of its divisors is an integer number (109710795).

Almost surely, 2^219421589 is an apocalyptic number.

It is an amenable number.

219421589 is a deficient number, since it is larger than the sum of its proper divisors (1).

219421589 is an equidigital number, since it uses as much as digits as its factorization.

219421589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 41.

The square root of 219421589 is about 14812.8859105847. The cubic root of 219421589 is about 603.1515551464.

The spelling of 219421589 in words is "two hundred nineteen million, four hundred twenty-one thousand, five hundred eighty-nine".