265631 has 4 divisors (see below), whose sum is σ = 266664. Its totient is φ = 264600.

The previous prime is 265621. The next prime is 265703. The reversal of 265631 is 136562.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 136562 = 2 ⋅68281.

It is a cyclic number.

It is not a de Polignac number, because 265631 - 2⁶ = 265567 is a prime.

It is a super-2 number, since 2×265631² = 141119656322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 265597 and 265606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221 + ... + 761.

It is an arithmetic number, because the mean of its divisors is an integer number (66666).

2²⁶⁵⁶³¹ is an apocalyptic number.

265631 is a deficient number, since it is larger than the sum of its proper divisors (1033).

265631 is an equidigital number, since it uses as much as digits as its factorization.

265631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032.

The product of its digits is 1080, while the sum is 23.

The square root of 265631 is about 515.3940240243. The cubic root of 265631 is about 64.2825237688.

The spelling of 265631 in words is "two hundred sixty-five thousand, six hundred thirty-one".