265801 has 4 divisors (see below), whose sum is σ = 267652. Its totient is φ = 263952.

The previous prime is 265787. The next prime is 265807. The reversal of 265801 is 108562.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89401 + 176400 = 299^2 + 420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265801 is a prime.

It is a Duffinian number.

265801 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (265807) 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, 690 + ... + 1003.

It is an arithmetic number, because the mean of its divisors is an integer number (66913).

2²⁶⁵⁸⁰¹ is an apocalyptic number.

It is an amenable number.

265801 is a deficient number, since it is larger than the sum of its proper divisors (1851).

265801 is a wasteful number, since it uses less digits than its factorization.

265801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 265801 is about 515.5589200082. The cubic root of 265801 is about 64.2962341397.

The spelling of 265801 in words is "two hundred sixty-five thousand, eight hundred one".