261935 has 4 divisors (see below), whose sum is σ = 314328. Its totient is φ = 209544.

The previous prime is 261917. The next prime is 261959. The reversal of 261935 is 539162.

261935 is nontrivially palindromic in base 15.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261935 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26189 + ... + 26198.

It is an arithmetic number, because the mean of its divisors is an integer number (78582).

2²⁶¹⁹³⁵ is an apocalyptic number.

261935 is a deficient number, since it is larger than the sum of its proper divisors (52393).

261935 is an equidigital number, since it uses as much as digits as its factorization.

261935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52392.

The product of its digits is 1620, while the sum is 26.

The square root of 261935 is about 511.7958577402. The cubic root of 261935 is about 63.9829870143.

The spelling of 261935 in words is "two hundred sixty-one thousand, nine hundred thirty-five".