275581 has 2 divisors, whose sum is σ = 275582. Its totient is φ = 275580.

The previous prime is 275579. The next prime is 275591. The reversal of 275581 is 185572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164025 + 111556 = 405^2 + 334^2 .

It is a cyclic number.

It is not a de Polignac number, because 275581 - 2¹ = 275579 is a prime.

It is a super-2 number, since 2×275581² = 151889775122, which contains 22 as substring.

Together with 275579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (275521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137790 + 137791.

It is an arithmetic number, because the mean of its divisors is an integer number (137791).

2²⁷⁵⁵⁸¹ is an apocalyptic number.

It is an amenable number.

275581 is a deficient number, since it is larger than the sum of its proper divisors (1).

275581 is an equidigital number, since it uses as much as digits as its factorization.

275581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2800, while the sum is 28.

The square root of 275581 is about 524.9580935656. The cubic root of 275581 is about 65.0753367121.

Subtracting from 275581 its reverse (185572), we obtain a palindrome (90009).

The spelling of 275581 in words is "two hundred seventy-five thousand, five hundred eighty-one".