2109139 has 4 divisors (see below), whose sum is σ = 2233224. Its totient is φ = 1985056.

The previous prime is 2109127. The next prime is 2109161. The reversal of 2109139 is 9319012.

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

It is not a de Polignac number, because 2109139 - 2⁷ = 2109011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2109109) 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, 62017 + ... + 62050.

It is an arithmetic number, because the mean of its divisors is an integer number (558306).

2^2109139 is an apocalyptic number.

2109139 is a deficient number, since it is larger than the sum of its proper divisors (124085).

2109139 is a wasteful number, since it uses less digits than its factorization.

2109139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124084.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 2109139 is about 1452.2875059712. The cubic root of 2109139 is about 128.2434129563.

The spelling of 2109139 in words is "two million, one hundred nine thousand, one hundred thirty-nine".