891245 has 4 divisors (see below), whose sum is σ = 1069500. Its totient is φ = 712992.

The previous prime is 891239. The next prime is 891251. The reversal of 891245 is 542198.

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

It is an interprime number because it is at equal distance from previous prime (891239) and next prime (891251).

It can be written as a sum of positive squares in 2 ways, for example, as 635209 + 256036 = 797^2 + 506^2 .

It is a cyclic number.

It is not a de Polignac number, because 891245 - 2¹⁰ = 890221 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89120 + ... + 89129.

It is an arithmetic number, because the mean of its divisors is an integer number (267375).

2⁸⁹¹²⁴⁵ is an apocalyptic number.

It is an amenable number.

891245 is a deficient number, since it is larger than the sum of its proper divisors (178255).

891245 is a wasteful number, since it uses less digits than its factorization.

891245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178254.

The product of its digits is 2880, while the sum is 29.

The square root of 891245 is about 944.0577312855. The cubic root of 891245 is about 96.2348489110.

The spelling of 891245 in words is "eight hundred ninety-one thousand, two hundred forty-five".