275561 has 16 divisors (see below), whose sum is σ = 338688. Its totient is φ = 220800.

The previous prime is 275549. The next prime is 275573. The reversal of 275561 is 165572.

It is an interprime number because it is at equal distance from previous prime (275549) and next prime (275573).

It is a cyclic number.

It is not a de Polignac number, because 275561 - 2¹⁴ = 259177 is a prime.

It is a Duffinian number.

It is a plaindrome in base 3, base 9 and base 15.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 275561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (275521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5840 + ... + 5886.

It is an arithmetic number, because the mean of its divisors is an integer number (21168).

2²⁷⁵⁵⁶¹ is an apocalyptic number.

It is an amenable number.

275561 is a deficient number, since it is larger than the sum of its proper divisors (63127).

275561 is a wasteful number, since it uses less digits than its factorization.

275561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112.

The product of its digits is 2100, while the sum is 26.

The square root of 275561 is about 524.9390440804. The cubic root of 275561 is about 65.0737624161.

The spelling of 275561 in words is "two hundred seventy-five thousand, five hundred sixty-one".