2139104509 has 4 divisors (see below), whose sum is σ = 2264934204. Its totient is φ = 2013274816.

The previous prime is 2139104497. The next prime is 2139104537. The reversal of 2139104509 is 9054019312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1353872025 + 785232484 = 36795^2 + 28022^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2139104509 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 (2139104549) 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 3 ways as a sum of consecutive naturals, for example, 62914822 + ... + 62914855.

It is an arithmetic number, because the mean of its divisors is an integer number (566233551).

Almost surely, 2^2139104509 is an apocalyptic number.

It is an amenable number.

2139104509 is a deficient number, since it is larger than the sum of its proper divisors (125829695).

2139104509 is a wasteful number, since it uses less digits than its factorization.

2139104509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125829694.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 2139104509 is about 46250.4541491216. The cubic root of 2139104509 is about 1288.4789694414.

The spelling of 2139104509 in words is "two billion, one hundred thirty-nine million, one hundred four thousand, five hundred nine".