891361 has 4 divisors (see below), whose sum is σ = 943812. Its totient is φ = 838912.

The previous prime is 891349. The next prime is 891377. The reversal of 891361 is 163198.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 705600 + 185761 = 840^2 + 431^2 .

It is a cyclic number.

It is not a de Polignac number, because 891361 - 2⁵ = 891329 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26200 + ... + 26233.

It is an arithmetic number, because the mean of its divisors is an integer number (235953).

2⁸⁹¹³⁶¹ is an apocalyptic number.

It is an amenable number.

891361 is a deficient number, since it is larger than the sum of its proper divisors (52451).

891361 is a wasteful number, since it uses less digits than its factorization.

891361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52450.

The product of its digits is 1296, while the sum is 28.

The square root of 891361 is about 944.1191662073. The cubic root of 891361 is about 96.2390238791.

The spelling of 891361 in words is "eight hundred ninety-one thousand, three hundred sixty-one".