219087989 has 4 divisors (see below), whose sum is σ = 225009324. Its totient is φ = 213166656.

The previous prime is 219087931. The next prime is 219087997. The reversal of 219087989 is 989780912.

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 186540964 + 32547025 = 13658^2 + 5705^2 .

It is a cyclic number.

It is not a de Polignac number, because 219087989 - 2⁸ = 219087733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 219087989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219087919) 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, 2960612 + ... + 2960685.

It is an arithmetic number, because the mean of its divisors is an integer number (56252331).

Almost surely, 2^219087989 is an apocalyptic number.

It is an amenable number.

219087989 is a deficient number, since it is larger than the sum of its proper divisors (5921335).

219087989 is an equidigital number, since it uses as much as digits as its factorization.

219087989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5921334.

The product of its (nonzero) digits is 653184, while the sum is 53.

The square root of 219087989 is about 14801.6211612107. The cubic root of 219087989 is about 602.8457307633.

The spelling of 219087989 in words is "two hundred nineteen million, eighty-seven thousand, nine hundred eighty-nine".