2181543339 has 8 divisors (see below), whose sum is σ = 2937524112. Its totient is φ = 1439962400.

The previous prime is 2181543323. The next prime is 2181543359. The reversal of 2181543339 is 9333451812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2181543339 - 2⁴ = 2181543323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2181543297 and 2181543306.

It is not an unprimeable number, because it can be changed into a prime (2181543319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3599604 + ... + 3600209.

It is an arithmetic number, because the mean of its divisors is an integer number (367190514).

Almost surely, 2^2181543339 is an apocalyptic number.

2181543339 is a deficient number, since it is larger than the sum of its proper divisors (755980773).

2181543339 is a wasteful number, since it uses less digits than its factorization.

2181543339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7199917.

The product of its digits is 77760, while the sum is 39.

The square root of 2181543339 is about 46706.9945404326. The cubic root of 2181543339 is about 1296.9441713986.

The spelling of 2181543339 in words is "two billion, one hundred eighty-one million, five hundred forty-three thousand, three hundred thirty-nine".