1849516821 has 10 divisors (see below), whose sum is σ = 2762858582. Its totient is φ = 1233011160.

The previous prime is 1849516813. The next prime is 1849516849. The reversal of 1849516821 is 1286159481.

It is a happy number.

1849516821 is a `hidden beast` number, since 18 + 49 + 516 + 82 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1235171025 + 614345796 = 35145^2 + 24786^2 .

It is not a de Polignac number, because 1849516821 - 2³ = 1849516813 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 (1849516811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 11416690 + ... + 11416851.

Almost surely, 2^1849516821 is an apocalyptic number.

It is an amenable number.

1849516821 is a deficient number, since it is larger than the sum of its proper divisors (913341761).

1849516821 is an equidigital number, since it uses as much as digits as its factorization.

1849516821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22833553 (or 22833544 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 1849516821 is about 43006.0091266325. The cubic root of 1849516821 is about 1227.4941428258.

The spelling of 1849516821 in words is "one billion, eight hundred forty-nine million, five hundred sixteen thousand, eight hundred twenty-one".