2189849491 has 2 divisors, whose sum is σ = 2189849492. Its totient is φ = 2189849490.

The previous prime is 2189849471. The next prime is 2189849513. The reversal of 2189849491 is 1949489812.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2189849491 - 2⁹ = 2189848979 is a prime.

It is a super-3 number, since 3×2189849491³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2189849411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094924745 + 1094924746.

It is an arithmetic number, because the mean of its divisors is an integer number (1094924746).

Almost surely, 2^2189849491 is an apocalyptic number.

2189849491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189849491 is an equidigital number, since it uses as much as digits as its factorization.

2189849491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 55.

The square root of 2189849491 is about 46795.8277093161. The cubic root of 2189849491 is about 1298.5881103408.

The spelling of 2189849491 in words is "two billion, one hundred eighty-nine million, eight hundred forty-nine thousand, four hundred ninety-one".