1821314159 has 16 divisors (see below), whose sum is σ = 2263514688. Its totient is φ = 1429581312.

The previous prime is 1821314153. The next prime is 1821314161. The reversal of 1821314159 is 9514131281.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1821314159 - 2²⁰ = 1820265583 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 (1821314153) 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 15 ways as a sum of consecutive naturals, for example, 202424 + ... + 211229.

It is an arithmetic number, because the mean of its divisors is an integer number (141469668).

Almost surely, 2^1821314159 is an apocalyptic number.

1821314159 is a deficient number, since it is larger than the sum of its proper divisors (442200529).

1821314159 is a wasteful number, since it uses less digits than its factorization.

1821314159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413714.

The product of its digits is 8640, while the sum is 35.

The square root of 1821314159 is about 42676.8574171061. The cubic root of 1821314159 is about 1221.2229426043. Note that the first 3 decimals are identical.

The spelling of 1821314159 in words is "one billion, eight hundred twenty-one million, three hundred fourteen thousand, one hundred fifty-nine".