265681 has 8 divisors (see below), whose sum is σ = 290304. Its totient is φ = 241680.

The previous prime is 265621. The next prime is 265703. The reversal of 265681 is 186562.

265681 is nontrivially palindromic in base 12.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 265681 - 2⁹ = 265169 is a prime.

It is a super-2 number, since 2×265681² = 141172787522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1296 + ... + 1486.

It is an arithmetic number, because the mean of its divisors is an integer number (36288).

2²⁶⁵⁶⁸¹ is an apocalyptic number.

It is an amenable number.

265681 is a deficient number, since it is larger than the sum of its proper divisors (24623).

265681 is a wasteful number, since it uses less digits than its factorization.

265681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311.

The product of its digits is 2880, while the sum is 28.

The square root of 265681 is about 515.4425283191. The cubic root of 265681 is about 64.2865568379.

It can be divided in two parts, 26568 and 1, that added together give a square (26569 = 163²).

The spelling of 265681 in words is "two hundred sixty-five thousand, six hundred eighty-one".