2155149 has 6 divisors (see below), whose sum is σ = 3113006. Its totient is φ = 1436760.

The previous prime is 2155133. The next prime is 2155159. The reversal of 2155149 is 9415512.

It can be written as a sum of positive squares in only one way, i.e., 2082249 + 72900 = 1443^2 + 270^2 .

It is not a de Polignac number, because 2155149 - 2⁴ = 2155133 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 (2155129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119722 + ... + 119739.

2^2155149 is an apocalyptic number.

It is an amenable number.

2155149 is a deficient number, since it is larger than the sum of its proper divisors (957857).

2155149 is a wasteful number, since it uses less digits than its factorization.

2155149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239467 (or 239464 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 2155149 is about 1468.0425743145. The cubic root of 2155149 is about 129.1692388434.

It can be divided in two parts, 2155 and 149, that added together give a square (2304 = 48²).

The spelling of 2155149 in words is "two million, one hundred fifty-five thousand, one hundred forty-nine".