891266 has 4 divisors (see below), whose sum is σ = 1336902. Its totient is φ = 445632.

The previous prime is 891251. The next prime is 891277. The reversal of 891266 is 662198.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 662198 = 2 ⋅331099.

It can be written as a sum of positive squares in only one way, i.e., 714025 + 177241 = 845^2 + 421^2 .

It is a Curzon number.

It is a nialpdrome in base 16.

It is an unprimeable number.

891266 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222815 + ... + 222818.

2⁸⁹¹²⁶⁶ is an apocalyptic number.

891266 is a deficient number, since it is larger than the sum of its proper divisors (445636).

891266 is a wasteful number, since it uses less digits than its factorization.

891266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445635.

The product of its digits is 5184, while the sum is 32.

The square root of 891266 is about 944.0688534212. The cubic root of 891266 is about 96.2356047511.

The spelling of 891266 in words is "eight hundred ninety-one thousand, two hundred sixty-six".