275221 has 4 divisors (see below), whose sum is σ = 277132. Its totient is φ = 273312.

The previous prime is 275207. The next prime is 275227. The reversal of 275221 is 122572.

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 36100 + 239121 = 190^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 275221 - 2⁹ = 274709 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 (275227) 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, 720 + ... + 1033.

It is an arithmetic number, because the mean of its divisors is an integer number (69283).

2²⁷⁵²²¹ is an apocalyptic number.

It is an amenable number.

275221 is a deficient number, since it is larger than the sum of its proper divisors (1911).

275221 is a wasteful number, since it uses less digits than its factorization.

275221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910.

The product of its digits is 280, while the sum is 19.

The square root of 275221 is about 524.6150969997. The cubic root of 275221 is about 65.0469877212.

Adding to 275221 its reverse (122572), we get a palindrome (397793).

It can be divided in two parts, 275 and 221, that added together give a triangular number (496 = T₃₁).

The spelling of 275221 in words is "two hundred seventy-five thousand, two hundred twenty-one".