2138511839 has 4 divisors (see below), whose sum is σ = 2147932824. Its totient is φ = 2129090856.

The previous prime is 2138511833. The next prime is 2138511841. The reversal of 2138511839 is 9381158312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2138511839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2138511796 and 2138511805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138511833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4710152 + ... + 4710605.

It is an arithmetic number, because the mean of its divisors is an integer number (536983206).

Almost surely, 2^2138511839 is an apocalyptic number.

2138511839 is a deficient number, since it is larger than the sum of its proper divisors (9420985).

2138511839 is an equidigital number, since it uses as much as digits as its factorization.

2138511839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9420984.

The product of its digits is 51840, while the sum is 41.

The square root of 2138511839 is about 46244.0465249312. The cubic root of 2138511839 is about 1288.3599611735.

The spelling of 2138511839 in words is "two billion, one hundred thirty-eight million, five hundred eleven thousand, eight hundred thirty-nine".