275381 has 4 divisors (see below), whose sum is σ = 277932. Its totient is φ = 272832.

The previous prime is 275371. The next prime is 275389. The reversal of 275381 is 183572.

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 122500 + 152881 = 350^2 + 391^2 .

It is a cyclic number.

It is not a de Polignac number, because 275381 - 2¹⁰ = 274357 is a prime.

It is a super-2 number, since 2×275381² = 151669390322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 275381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (275389) 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, 1106 + ... + 1331.

It is an arithmetic number, because the mean of its divisors is an integer number (69483).

2²⁷⁵³⁸¹ is an apocalyptic number.

275381 is the 281-st centered heptagonal number.

It is an amenable number.

275381 is a deficient number, since it is larger than the sum of its proper divisors (2551).

275381 is a wasteful number, since it uses less digits than its factorization.

275381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550.

The product of its digits is 1680, while the sum is 26.

The square root of 275381 is about 524.7675675954. The cubic root of 275381 is about 65.0595903228.

Subtracting from 275381 its reverse (183572), we obtain a square (91809 = 303²).

It can be divided in two parts, 275 and 381, that added together give a palindrome (656).

The spelling of 275381 in words is "two hundred seventy-five thousand, three hundred eighty-one".