2049989191 has 4 divisors (see below), whose sum is σ = 2057390152. Its totient is φ = 2042588232.

The previous prime is 2049989189. The next prime is 2049989203. The reversal of 2049989191 is 1919899402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1919899402 = 2 ⋅959949701.

It is a cyclic number.

It is not a de Polignac number, because 2049989191 - 2¹ = 2049989189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2043989191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3700065 + ... + 3700618.

It is an arithmetic number, because the mean of its divisors is an integer number (514347538).

Almost surely, 2^2049989191 is an apocalyptic number.

2049989191 is a deficient number, since it is larger than the sum of its proper divisors (7400961).

2049989191 is an equidigital number, since it uses as much as digits as its factorization.

2049989191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7400960.

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 2049989191 is about 45276.8063250932. The cubic root of 2049989191 is about 1270.3318600789.

The spelling of 2049989191 in words is "two billion, forty-nine million, nine hundred eighty-nine thousand, one hundred ninety-one".