264491 has 4 divisors (see below), whose sum is σ = 270984. Its totient is φ = 258000.

The previous prime is 264487. The next prime is 264527. The reversal of 264491 is 194462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194462 = 2 ⋅97231.

It is a cyclic number.

It is not a de Polignac number, because 264491 - 2² = 264487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 264491.

It is not an unprimeable number, because it can be changed into a prime (264091) 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, 3185 + ... + 3266.

It is an arithmetic number, because the mean of its divisors is an integer number (67746).

2²⁶⁴⁴⁹¹ is an apocalyptic number.

264491 is a deficient number, since it is larger than the sum of its proper divisors (6493).

264491 is an equidigital number, since it uses as much as digits as its factorization.

264491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6492.

The product of its digits is 1728, while the sum is 26.

The square root of 264491 is about 514.2868849193. The cubic root of 264491 is about 64.1904321556.

The spelling of 264491 in words is "two hundred sixty-four thousand, four hundred ninety-one".