219317989 has 4 divisors (see below), whose sum is σ = 239256000. Its totient is φ = 199379980.

The previous prime is 219317977. The next prime is 219317993. The reversal of 219317989 is 989713912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 219317989 - 2²¹ = 217220837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219317939) 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 in 3 ways as a sum of consecutive naturals, for example, 9968989 + ... + 9969010.

It is an arithmetic number, because the mean of its divisors is an integer number (59814000).

Almost surely, 2^219317989 is an apocalyptic number.

It is an amenable number.

219317989 is a deficient number, since it is larger than the sum of its proper divisors (19938011).

219317989 is a wasteful number, since it uses less digits than its factorization.

219317989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19938010.

The product of its digits is 244944, while the sum is 49.

The square root of 219317989 is about 14809.3885424078. The cubic root of 219317989 is about 603.0566141118.

The spelling of 219317989 in words is "two hundred nineteen million, three hundred seventeen thousand, nine hundred eighty-nine".