1849113991 has 4 divisors (see below), whose sum is σ = 1946435800. Its totient is φ = 1751792184.

The previous prime is 1849113977. The next prime is 1849114027. The reversal of 1849113991 is 1993119481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1993119481 = 2543 ⋅783767.

It is a cyclic number.

It is not a de Polignac number, because 1849113991 - 2⁹ = 1849113479 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 (1849113901) 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, 48660876 + ... + 48660913.

It is an arithmetic number, because the mean of its divisors is an integer number (486608950).

Almost surely, 2^1849113991 is an apocalyptic number.

1849113991 is a deficient number, since it is larger than the sum of its proper divisors (97321809).

1849113991 is an equidigital number, since it uses as much as digits as its factorization.

1849113991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97321808.

The product of its digits is 69984, while the sum is 46.

The square root of 1849113991 is about 43001.3254563159. The cubic root of 1849113991 is about 1227.4050191219.

The spelling of 1849113991 in words is "one billion, eight hundred forty-nine million, one hundred thirteen thousand, nine hundred ninety-one".