219716989 has 4 divisors (see below), whose sum is σ = 225655324. Its totient is φ = 213778656.

The previous prime is 219716983. The next prime is 219717031. The reversal of 219716989 is 989617912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103184964 + 116532025 = 10158^2 + 10795^2 .

It is a cyclic number.

It is not a de Polignac number, because 219716989 - 2²¹ = 217619837 is a prime.

It is a super-2 number, since 2×219716989² = 96551110510452242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219716983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2969112 + ... + 2969185.

It is an arithmetic number, because the mean of its divisors is an integer number (56413831).

Almost surely, 2^219716989 is an apocalyptic number.

It is an amenable number.

219716989 is a deficient number, since it is larger than the sum of its proper divisors (5938335).

219716989 is an equidigital number, since it uses as much as digits as its factorization.

219716989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5938334.

The product of its digits is 489888, while the sum is 52.

The square root of 219716989 is about 14822.8536051598. The cubic root of 219716989 is about 603.4221014111.

The spelling of 219716989 in words is "two hundred nineteen million, seven hundred sixteen thousand, nine hundred eighty-nine".