1821134349 has 12 divisors (see below), whose sum is σ = 2636608156. Its totient is φ = 1211283072.

The previous prime is 1821134347. The next prime is 1821134353. The reversal of 1821134349 is 9434311281.

1821134349 is a `hidden beast` number, since 1 + 8 + 211 + 3 + 434 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 685916100 + 1135218249 = 26190^2 + 33693^2 .

It is not a de Polignac number, because 1821134349 - 2¹ = 1821134347 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821134347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229762 + ... + 237555.

Almost surely, 2^1821134349 is an apocalyptic number.

It is an amenable number.

1821134349 is a deficient number, since it is larger than the sum of its proper divisors (815473807).

1821134349 is a wasteful number, since it uses less digits than its factorization.

1821134349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467756 (or 467753 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1821134349 is about 42674.7507198343. The cubic root of 1821134349 is about 1221.1827527002.

The spelling of 1821134349 in words is "one billion, eight hundred twenty-one million, one hundred thirty-four thousand, three hundred forty-nine".