2139995539 has 4 divisors (see below), whose sum is σ = 2334540600. Its totient is φ = 1945450480.

The previous prime is 2139995519. The next prime is 2139995551. The reversal of 2139995539 is 9355999312.

It is a happy number.

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 2139995539 - 2⁹ = 2139995027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2139995539.

It is not an unprimeable number, because it can be changed into a prime (2139995519) 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, 97272514 + ... + 97272535.

It is an arithmetic number, because the mean of its divisors is an integer number (583635150).

Almost surely, 2^2139995539 is an apocalyptic number.

2139995539 is a deficient number, since it is larger than the sum of its proper divisors (194545061).

2139995539 is a wasteful number, since it uses less digits than its factorization.

2139995539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194545060.

The product of its digits is 2952450, while the sum is 55.

The square root of 2139995539 is about 46260.0858083943. The cubic root of 2139995539 is about 1288.6578471043.

The spelling of 2139995539 in words is "two billion, one hundred thirty-nine million, nine hundred ninety-five thousand, five hundred thirty-nine".