2139138291 has 16 divisors (see below), whose sum is σ = 2946198528. Its totient is φ = 1379148000.

The previous prime is 2139138263. The next prime is 2139138311. The reversal of 2139138291 is 1928319312.

It is not a de Polignac number, because 2139138291 - 2⁷ = 2139138163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2139138241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145216 + ... + 159266.

It is an arithmetic number, because the mean of its divisors is an integer number (184137408).

Almost surely, 2^2139138291 is an apocalyptic number.

2139138291 is a deficient number, since it is larger than the sum of its proper divisors (807060237).

2139138291 is a wasteful number, since it uses less digits than its factorization.

2139138291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15722.

The product of its digits is 23328, while the sum is 39.

The square root of 2139138291 is about 46250.8193549044. The cubic root of 2139138291 is about 1288.4857522123.

The spelling of 2139138291 in words is "two billion, one hundred thirty-nine million, one hundred thirty-eight thousand, two hundred ninety-one".