265591 has 6 divisors (see below), whose sum is σ = 282440. Its totient is φ = 249696.

The previous prime is 265579. The next prime is 265607. The reversal of 265591 is 195562.

It is not a de Polignac number, because 265591 - 2⁹ = 265079 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 171 + ... + 748.

2²⁶⁵⁵⁹¹ is an apocalyptic number.

265591 is a deficient number, since it is larger than the sum of its proper divisors (16849).

265591 is an equidigital number, since it uses as much as digits as its factorization.

265591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953 (or 936 counting only the distinct ones).

The product of its digits is 2700, while the sum is 28.

The square root of 265591 is about 515.3552173016. The cubic root of 265591 is about 64.2792969491.

The spelling of 265591 in words is "two hundred sixty-five thousand, five hundred ninety-one".