265491 has 8 divisors (see below), whose sum is σ = 393360. Its totient is φ = 176976.

The previous prime is 265483. The next prime is 265493. The reversal of 265491 is 194562.

265491 is a `hidden beast` number, since 2 + 654 + 9 + 1 = 666.

It is not a de Polignac number, because 265491 - 2³ = 265483 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 9833 = 265491 / (2 + 6 + 5 + 4 + 9 + 1).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 265491.

It is not an unprimeable number, because it can be changed into a prime (265493) 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 7 ways as a sum of consecutive naturals, for example, 4890 + ... + 4943.

It is an arithmetic number, because the mean of its divisors is an integer number (49170).

2²⁶⁵⁴⁹¹ is an apocalyptic number.

265491 is a deficient number, since it is larger than the sum of its proper divisors (127869).

265491 is an equidigital number, since it uses as much as digits as its factorization.

265491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9842 (or 9836 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 265491 is about 515.2581877079. The cubic root of 265491 is about 64.2712284821.

The spelling of 265491 in words is "two hundred sixty-five thousand, four hundred ninety-one".