2161255 has 4 divisors (see below), whose sum is σ = 2593512. Its totient is φ = 1729000.

The previous prime is 2161253. The next prime is 2161259. The reversal of 2161255 is 5521612.

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

It is not a de Polignac number, because 2161255 - 2¹ = 2161253 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161253) 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, 216121 + ... + 216130.

It is an arithmetic number, because the mean of its divisors is an integer number (648378).

2^2161255 is an apocalyptic number.

2161255 is a deficient number, since it is larger than the sum of its proper divisors (432257).

2161255 is an equidigital number, since it uses as much as digits as its factorization.

2161255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432256.

The product of its digits is 600, while the sum is 22.

The square root of 2161255 is about 1470.1207433405. The cubic root of 2161255 is about 129.2911118839.

Adding to 2161255 its reverse (5521612), we get a palindrome (7682867).

The spelling of 2161255 in words is "two million, one hundred sixty-one thousand, two hundred fifty-five".