2139843181 has 6 divisors (see below), whose sum is σ = 2489205390. Its totient is φ = 1834151256.

The previous prime is 2139843161. The next prime is 2139843187. The reversal of 2139843181 is 1813489312.

It can be written as a sum of positive squares in only one way, i.e., 2105433225 + 34409956 = 45885^2 + 5866^2 .

It is not a de Polignac number, because 2139843181 - 2²⁹ = 1602972269 is a prime.

It is a super-2 number, since 2×2139843181² = 9157857678544397522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139843187) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21835086 + ... + 21835183.

It is an arithmetic number, because the mean of its divisors is an integer number (414867565).

Almost surely, 2^2139843181 is an apocalyptic number.

It is an amenable number.

2139843181 is a deficient number, since it is larger than the sum of its proper divisors (349362209).

2139843181 is an equidigital number, since it uses as much as digits as its factorization.

2139843181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43670283 (or 43670276 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 2139843181 is about 46258.4390246796. The cubic root of 2139843181 is about 1288.6272641758.

The spelling of 2139843181 in words is "two billion, one hundred thirty-nine million, eight hundred forty-three thousand, one hundred eighty-one".