2189944191 has 8 divisors (see below), whose sum is σ = 3014116864. Its totient is φ = 1412867160.

The previous prime is 2189944177. The next prime is 2189944213. The reversal of 2189944191 is 1914499812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2189944191 - 2¹⁴ = 2189927807 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 2189944191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189944121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11773801 + ... + 11773986.

It is an arithmetic number, because the mean of its divisors is an integer number (376764608).

Almost surely, 2^2189944191 is an apocalyptic number.

2189944191 is a deficient number, since it is larger than the sum of its proper divisors (824172673).

2189944191 is a wasteful number, since it uses less digits than its factorization.

2189944191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23547821.

The product of its digits is 186624, while the sum is 48.

The square root of 2189944191 is about 46796.8395407211. The cubic root of 2189944191 is about 1298.6068292105.

The spelling of 2189944191 in words is "two billion, one hundred eighty-nine million, nine hundred forty-four thousand, one hundred ninety-one".