845881 has 2 divisors, whose sum is σ = 845882. Its totient is φ = 845880.

The previous prime is 845879. The next prime is 845893. The reversal of 845881 is 188548.

845881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 826281 + 19600 = 909^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 845881 - 2¹ = 845879 is a prime.

It is a super-2 number, since 2×845881² = 1431029332322, which contains 22 as substring.

Together with 845879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (845381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422940 + 422941.

It is an arithmetic number, because the mean of its divisors is an integer number (422941).

2⁸⁴⁵⁸⁸¹ is an apocalyptic number.

It is an amenable number.

845881 is a deficient number, since it is larger than the sum of its proper divisors (1).

845881 is an equidigital number, since it uses as much as digits as its factorization.

845881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10240, while the sum is 34.

The square root of 845881 is about 919.7178915298. The cubic root of 845881 is about 94.5735642110.

The spelling of 845881 in words is "eight hundred forty-five thousand, eight hundred eighty-one".