2155139 has 16 divisors (see below), whose sum is σ = 2593728. Its totient is φ = 1752192.

The previous prime is 2155133. The next prime is 2155159. The reversal of 2155139 is 9315512.

It is a cyclic number.

It is not a de Polignac number, because 2155139 - 2²⁰ = 1106563 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 (2155133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13649 + ... + 13805.

It is an arithmetic number, because the mean of its divisors is an integer number (162108).

2^2155139 is an apocalyptic number.

2155139 is a deficient number, since it is larger than the sum of its proper divisors (438589).

2155139 is a wasteful number, since it uses less digits than its factorization.

2155139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254.

The product of its digits is 1350, while the sum is 26.

The square root of 2155139 is about 1468.0391684148. The cubic root of 2155139 is about 129.1690390592.

The spelling of 2155139 in words is "two million, one hundred fifty-five thousand, one hundred thirty-nine".