2189941889 has 4 divisors (see below), whose sum is σ = 2190120660. Its totient is φ = 2189763120.

The previous prime is 2189941877. The next prime is 2189941891. The reversal of 2189941889 is 9881499812.

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 1326052225 + 863889664 = 36415^2 + 29392^2 .

It is a cyclic number.

It is not a de Polignac number, because 2189941889 - 2²⁰ = 2188893313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2189941189) 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, 69542 + ... + 95999.

It is an arithmetic number, because the mean of its divisors is an integer number (547530165).

Almost surely, 2^2189941889 is an apocalyptic number.

It is an amenable number.

2189941889 is a deficient number, since it is larger than the sum of its proper divisors (178771).

2189941889 is a wasteful number, since it uses less digits than its factorization.

2189941889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178770.

The product of its digits is 2985984, while the sum is 59.

The square root of 2189941889 is about 46796.8149450366. The cubic root of 2189941889 is about 1298.6063741922.

The spelling of 2189941889 in words is "two billion, one hundred eighty-nine million, nine hundred forty-one thousand, eight hundred eighty-nine".