2155249 has 4 divisors (see below), whose sum is σ = 2174436. Its totient is φ = 2136064.

The previous prime is 2155207. The next prime is 2155253. The reversal of 2155249 is 9425512.

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 32400 + 2122849 = 180^2 + 1457^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155249 - 2⁷ = 2155121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155259) 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, 9424 + ... + 9649.

It is an arithmetic number, because the mean of its divisors is an integer number (543609).

2^2155249 is an apocalyptic number.

It is an amenable number.

2155249 is a deficient number, since it is larger than the sum of its proper divisors (19187).

2155249 is a wasteful number, since it uses less digits than its factorization.

2155249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19186.

The product of its digits is 3600, while the sum is 28.

The square root of 2155249 is about 1468.0766328772. The cubic root of 2155249 is about 129.1712366518.

The spelling of 2155249 in words is "two million, one hundred fifty-five thousand, two hundred forty-nine".