2189090291 has 4 divisors (see below), whose sum is σ = 2194443000. Its totient is φ = 2183737584.

The previous prime is 2189090287. The next prime is 2189090359. The reversal of 2189090291 is 1920909812.

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

It is a cyclic number.

It is not a de Polignac number, because 2189090291 - 2² = 2189090287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2189020291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2675741 + ... + 2676558.

It is an arithmetic number, because the mean of its divisors is an integer number (548610750).

Almost surely, 2^2189090291 is an apocalyptic number.

2189090291 is a deficient number, since it is larger than the sum of its proper divisors (5352709).

2189090291 is an equidigital number, since it uses as much as digits as its factorization.

2189090291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5352708.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 2189090291 is about 46787.7151718269. The cubic root of 2189090291 is about 1298.4380236108.

The spelling of 2189090291 in words is "two billion, one hundred eighty-nine million, ninety thousand, two hundred ninety-one".