265691 has 4 divisors (see below), whose sum is σ = 271392. Its totient is φ = 259992.

The previous prime is 265621. The next prime is 265703. The reversal of 265691 is 196562.

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 265691 - 2¹⁸ = 3547 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 265691.

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 3 ways as a sum of consecutive naturals, for example, 2780 + ... + 2873.

It is an arithmetic number, because the mean of its divisors is an integer number (67848).

265691 is a Friedman number, since it can be written as (9^6+1)/2-6*5, using all its digits and the basic arithmetic operations.

2²⁶⁵⁶⁹¹ is an apocalyptic number.

265691 is a deficient number, since it is larger than the sum of its proper divisors (5701).

265691 is an equidigital number, since it uses as much as digits as its factorization.

265691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5700.

The product of its digits is 3240, while the sum is 29.

The square root of 265691 is about 515.4522286304. The cubic root of 265691 is about 64.2873633910.

The spelling of 265691 in words is "two hundred sixty-five thousand, six hundred ninety-one".