265649 has 4 divisors (see below), whose sum is σ = 267120. Its totient is φ = 264180.

The previous prime is 265621. The next prime is 265703. The reversal of 265649 is 946562.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (265619) 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, 419 + ... + 840.

It is an arithmetic number, because the mean of its divisors is an integer number (66780).

2²⁶⁵⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

265649 is a deficient number, since it is larger than the sum of its proper divisors (1471).

265649 is a wasteful number, since it uses less digits than its factorization.

265649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470.

The product of its digits is 12960, while the sum is 32.

The square root of 265649 is about 515.4114860963. The cubic root of 265649 is about 64.2839757319.

The spelling of 265649 in words is "two hundred sixty-five thousand, six hundred forty-nine".