2189491 has 2 divisors, whose sum is σ = 2189492. Its totient is φ = 2189490.

The previous prime is 2189477. The next prime is 2189513. The reversal of 2189491 is 1949812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2189491 - 2⁵ = 2189459 is a prime.

It is not a weakly prime, because it can be changed into another prime (2189461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094745 + 1094746.

It is an arithmetic number, because the mean of its divisors is an integer number (1094746).

2^2189491 is an apocalyptic number.

2189491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189491 is an equidigital number, since it uses as much as digits as its factorization.

2189491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 34.

The square root of 2189491 is about 1479.6928735383. The cubic root of 2189491 is about 129.8517244351.

The spelling of 2189491 in words is "two million, one hundred eighty-nine thousand, four hundred ninety-one".