891265 has 8 divisors (see below), whose sum is σ = 1074600. Its totient is φ = 709632.

The previous prime is 891251. The next prime is 891277. The reversal of 891265 is 562198.

It can be written as a sum of positive squares in 4 ways, for example, as 178929 + 712336 = 423^2 + 844^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 891265 - 2¹³ = 883073 is a prime.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1761 + ... + 2209.

It is an arithmetic number, because the mean of its divisors is an integer number (134325).

2⁸⁹¹²⁶⁵ is an apocalyptic number.

It is an amenable number.

891265 is a deficient number, since it is larger than the sum of its proper divisors (183335).

891265 is a wasteful number, since it uses less digits than its factorization.

891265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851.

The product of its digits is 4320, while the sum is 31.

The square root of 891265 is about 944.0683237987. The cubic root of 891265 is about 96.2355687589.

It can be divided in two parts, 891 and 265, that added together give a square (1156 = 34²).

The spelling of 891265 in words is "eight hundred ninety-one thousand, two hundred sixty-five".