265881 has 16 divisors (see below), whose sum is σ = 442368. Its totient is φ = 138000.

The previous prime is 265873. The next prime is 265883. The reversal of 265881 is 188562.

It is not a de Polignac number, because 265881 - 2³ = 265873 is a prime.

It is a super-2 number, since 2×265881² = 141385412322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (265883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345 + ... + 806.

It is an arithmetic number, because the mean of its divisors is an integer number (27648).

2²⁶⁵⁸⁸¹ is an apocalyptic number.

265881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

265881 is a deficient number, since it is larger than the sum of its proper divisors (176487).

265881 is a wasteful number, since it uses less digits than its factorization.

265881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172.

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

The square root of 265881 is about 515.6364998718. The cubic root of 265881 is about 64.3026840562.

The spelling of 265881 in words is "two hundred sixty-five thousand, eight hundred eighty-one".