845281 has 4 divisors (see below), whose sum is σ = 847872. Its totient is φ = 842692.

The previous prime is 845279. The next prime is 845287. The reversal of 845281 is 182548.

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 not a de Polignac number, because 845281 - 2¹ = 845279 is a prime.

It is a super-2 number, since 2×845281² = 1428999937922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (845287) 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, 721 + ... + 1486.

It is an arithmetic number, because the mean of its divisors is an integer number (211968).

2⁸⁴⁵²⁸¹ is an apocalyptic number.

It is an amenable number.

845281 is a deficient number, since it is larger than the sum of its proper divisors (2591).

845281 is a wasteful number, since it uses less digits than its factorization.

845281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590.

The product of its digits is 2560, while the sum is 28.

The square root of 845281 is about 919.3916466882. The cubic root of 845281 is about 94.5511979600.

The spelling of 845281 in words is "eight hundred forty-five thousand, two hundred eighty-one".