2181363439 has 2 divisors, whose sum is σ = 2181363440. Its totient is φ = 2181363438.

The previous prime is 2181363433. The next prime is 2181363461. The reversal of 2181363439 is 9343631812.

It is a happy number.

2181363439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2181363439 - 2⁵ = 2181363407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181363433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090681719 + 1090681720.

It is an arithmetic number, because the mean of its divisors is an integer number (1090681720).

Almost surely, 2^2181363439 is an apocalyptic number.

2181363439 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181363439 is an equidigital number, since it uses as much as digits as its factorization.

2181363439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 40.

The square root of 2181363439 is about 46705.0686649747. The cubic root of 2181363439 is about 1296.9085197774.

The spelling of 2181363439 in words is "two billion, one hundred eighty-one million, three hundred sixty-three thousand, four hundred thirty-nine".