260561 has 4 divisors (see below), whose sum is σ = 297792. Its totient is φ = 223332.

The previous prime is 260551. The next prime is 260569. The reversal of 260561 is 165062.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165062 = 2 ⋅82531.

It is a cyclic number.

It is not a de Polignac number, because 260561 - 2¹⁰ = 259537 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 (260569) 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, 18605 + ... + 18618.

It is an arithmetic number, because the mean of its divisors is an integer number (74448).

2²⁶⁰⁵⁶¹ is an apocalyptic number.

It is an amenable number.

260561 is a deficient number, since it is larger than the sum of its proper divisors (37231).

260561 is an equidigital number, since it uses as much as digits as its factorization.

260561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37230.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 260561 is about 510.4517606983. The cubic root of 260561 is about 63.8709149466.

The spelling of 260561 in words is "two hundred sixty thousand, five hundred sixty-one".