261335 has 4 divisors (see below), whose sum is σ = 313608. Its totient is φ = 209064.

The previous prime is 261329. The next prime is 261337. The reversal of 261335 is 533162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261335 - 2⁶ = 261271 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 (261337) 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, 26129 + ... + 26138.

It is an arithmetic number, because the mean of its divisors is an integer number (78402).

2²⁶¹³³⁵ is an apocalyptic number.

261335 is a deficient number, since it is larger than the sum of its proper divisors (52273).

261335 is an equidigital number, since it uses as much as digits as its factorization.

261335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52272.

The product of its digits is 540, while the sum is 20.

The square root of 261335 is about 511.2093504622. The cubic root of 261335 is about 63.9340955692.

Adding to 261335 its reverse (533162), we get a palindrome (794497).

The spelling of 261335 in words is "two hundred sixty-one thousand, three hundred thirty-five".