• 265 can be written using four 4's:
265 has 4 divisors (see below), whose sum is σ = 324. Its totient is φ = 208.
The previous prime is 263. The next prime is 269. The reversal of 265 is 562.
265 is nontrivially palindromic in base 12.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 562 = 2 ⋅281.
It can be written as a sum of positive squares in 2 ways, for example, as 144 + 121 = 12^2 + 11^2 .
It is a cyclic number.
It is not a de Polignac number, because 265 - 21 = 263 is a prime.
It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is a magnanimous number.
It is a Duffinian number.
265 is an undulating number in base 12.
It is a plaindrome in base 14 and base 15.
It is a nialpdrome in base 8 and base 11.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (263) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (3) of ones.
It is a subfactorial, being equal to the number of derangements of 6 objects .
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22 + ... + 31.
It is an arithmetic number, because the mean of its divisors is an integer number (81).
265 is the 12-th centered square number.
It is an amenable number.
265 is a deficient number, since it is larger than the sum of its proper divisors (59).
265 is an equidigital number, since it uses as much as digits as its factorization.
It is an anagram of its base 7 representation: 265 = (526)7.
265 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 58.
The product of its digits is 60, while the sum is 13.
The square root of 265 is about 16.2788205961. The cubic root of 265 is about 6.4231582886.
Subtracting from 265 its sum of digits (13), we obtain a palindrome (252).
Adding to 265 its product of digits (60), we get a triangular number (325 = T25).
The spelling of 265 in words is "two hundred sixty-five", and thus it is an aban number.
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