2143919181 has 16 divisors (see below), whose sum is σ = 3048494400. Its totient is φ = 1335522048.

The previous prime is 2143919177. The next prime is 2143919203. The reversal of 2143919181 is 1819193412.

It is not a de Polignac number, because 2143919181 - 2² = 2143919177 is a prime.

It is a super-2 number, since 2×2143919181² = 9192778909319421522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143919581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144126 + ... + 158303.

It is an arithmetic number, because the mean of its divisors is an integer number (190530900).

Almost surely, 2^2143919181 is an apocalyptic number.

It is an amenable number.

2143919181 is a deficient number, since it is larger than the sum of its proper divisors (904575219).

2143919181 is a wasteful number, since it uses less digits than its factorization.

2143919181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302588.

The product of its digits is 15552, while the sum is 39.

The square root of 2143919181 is about 46302.4748906578. The cubic root of 2143919181 is about 1289.4449429861. Note that the first 3 decimals are identical.

The spelling of 2143919181 in words is "two billion, one hundred forty-three million, nine hundred nineteen thousand, one hundred eighty-one".