2215139 has 4 divisors (see below), whose sum is σ = 2234856. Its totient is φ = 2195424.

The previous prime is 2215133. The next prime is 2215141. The reversal of 2215139 is 9315122.

2215139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9315122 = 2 ⋅4657561.

It is a cyclic number.

It is not a de Polignac number, because 2215139 - 2²⁰ = 1166563 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2215133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9689 + ... + 9914.

It is an arithmetic number, because the mean of its divisors is an integer number (558714).

2^2215139 is an apocalyptic number.

2215139 is a deficient number, since it is larger than the sum of its proper divisors (19717).

2215139 is a wasteful number, since it uses less digits than its factorization.

2215139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19716.

The product of its digits is 540, while the sum is 23.

The square root of 2215139 is about 1488.3343038444. The cubic root of 2215139 is about 130.3567910775.

The spelling of 2215139 in words is "two million, two hundred fifteen thousand, one hundred thirty-nine".