845161 has 4 divisors (see below), whose sum is σ = 853972. Its totient is φ = 836352.

The previous prime is 845137. The next prime is 845167. The reversal of 845161 is 161548.

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 648025 + 197136 = 805^2 + 444^2 .

It is a cyclic number.

It is not a de Polignac number, because 845161 - 2⁵ = 845129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (845167) 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, 4260 + ... + 4453.

It is an arithmetic number, because the mean of its divisors is an integer number (213493).

2⁸⁴⁵¹⁶¹ is an apocalyptic number.

It is an amenable number.

845161 is a deficient number, since it is larger than the sum of its proper divisors (8811).

845161 is an equidigital number, since it uses as much as digits as its factorization.

845161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8810.

The product of its digits is 960, while the sum is 25.

The square root of 845161 is about 919.3263838268. The cubic root of 845161 is about 94.5467234398.

The spelling of 845161 in words is "eight hundred forty-five thousand, one hundred sixty-one".