2139438911 has 4 divisors (see below), whose sum is σ = 2147962824. Its totient is φ = 2130915000.

The previous prime is 2139438881. The next prime is 2139438913. The reversal of 2139438911 is 1198349312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2139438911 - 2²⁶ = 2072330047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139438913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4261580 + ... + 4262081.

It is an arithmetic number, because the mean of its divisors is an integer number (536990706).

Almost surely, 2^2139438911 is an apocalyptic number.

2139438911 is a deficient number, since it is larger than the sum of its proper divisors (8523913).

2139438911 is an equidigital number, since it uses as much as digits as its factorization.

2139438911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8523912.

The product of its digits is 46656, while the sum is 41.

The square root of 2139438911 is about 46254.0691291047. The cubic root of 2139438911 is about 1288.5461077373.

The spelling of 2139438911 in words is "two billion, one hundred thirty-nine million, four hundred thirty-eight thousand, nine hundred eleven".