2181902339 has 2 divisors, whose sum is σ = 2181902340. Its totient is φ = 2181902338.

The previous prime is 2181902323. The next prime is 2181902389. The reversal of 2181902339 is 9332091812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2181902339 - 2⁴ = 2181902323 is a prime.

It is not a weakly prime, because it can be changed into another prime (2181902389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090951169 + 1090951170.

It is an arithmetic number, because the mean of its divisors is an integer number (1090951170).

Almost surely, 2^2181902339 is an apocalyptic number.

2181902339 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181902339 is an equidigital number, since it uses as much as digits as its factorization.

2181902339 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 2181902339 is about 46710.8374898160. The cubic root of 2181902339 is about 1297.0153102434.

The spelling of 2181902339 in words is "two billion, one hundred eighty-one million, nine hundred two thousand, three hundred thirty-nine".