268581 has 4 divisors (see below), whose sum is σ = 358112. Its totient is φ = 179052.

The previous prime is 268573. The next prime is 268607. The reversal of 268581 is 185862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 268581 - 2³ = 268573 is a prime.

It is a super-2 number, since 2×268581² = 144271507122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 268581.

It is not an unprimeable number, because it can be changed into a prime (268501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44761 + ... + 44766.

It is an arithmetic number, because the mean of its divisors is an integer number (89528).

2²⁶⁸⁵⁸¹ is an apocalyptic number.

It is an amenable number.

268581 is a deficient number, since it is larger than the sum of its proper divisors (89531).

268581 is an equidigital number, since it uses as much as digits as its factorization.

268581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89530.

The product of its digits is 3840, while the sum is 30.

The square root of 268581 is about 518.2480101264. The cubic root of 268581 is about 64.5196142499.

The spelling of 268581 in words is "two hundred sixty-eight thousand, five hundred eighty-one".