2181063939 has 8 divisors (see below), whose sum is σ = 2926608720. Its totient is φ = 1444780896.

The previous prime is 2181063923. The next prime is 2181063959. The reversal of 2181063939 is 9393601812.

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

It is not a de Polignac number, because 2181063939 - 2⁴ = 2181063923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2181063939.

It is not an unprimeable number, because it can be changed into a prime (2181063959) 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, 2314884 + ... + 2315825.

It is an arithmetic number, because the mean of its divisors is an integer number (365826090).

Almost surely, 2^2181063939 is an apocalyptic number.

2181063939 is a deficient number, since it is larger than the sum of its proper divisors (745544781).

2181063939 is a wasteful number, since it uses less digits than its factorization.

2181063939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4630869.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 2181063939 is about 46701.8622647963. The cubic root of 2181063939 is about 1296.8491621186.

The spelling of 2181063939 in words is "two billion, one hundred eighty-one million, sixty-three thousand, nine hundred thirty-nine".