268691 has 4 divisors (see below), whose sum is σ = 271800. Its totient is φ = 265584.

The previous prime is 268661. The next prime is 268693. The reversal of 268691 is 196862.

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 268691 - 2¹⁰ = 267667 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 268691.

It is not an unprimeable number, because it can be changed into a prime (268693) 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, 1421 + ... + 1598.

It is an arithmetic number, because the mean of its divisors is an integer number (67950).

2²⁶⁸⁶⁹¹ is an apocalyptic number.

268691 is a deficient number, since it is larger than the sum of its proper divisors (3109).

268691 is an equidigital number, since it uses as much as digits as its factorization.

268691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3108.

The product of its digits is 5184, while the sum is 32.

The square root of 268691 is about 518.3541260567. The cubic root of 268691 is about 64.5284212627.

It can be divided in two parts, 268 and 691, that added together give a palindrome (959).

The spelling of 268691 in words is "two hundred sixty-eight thousand, six hundred ninety-one".