845109 has 6 divisors (see below), whose sum is σ = 1220726. Its totient is φ = 563400.

The previous prime is 845099. The next prime is 845111. The reversal of 845109 is 901548.

It can be written as a sum of positive squares in only one way, i.e., 756900 + 88209 = 870^2 + 297^2 .

It is not a de Polignac number, because 845109 - 2¹² = 841013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 845109.

It is not an unprimeable number, because it can be changed into a prime (845129) 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 5 ways as a sum of consecutive naturals, for example, 46942 + ... + 46959.

2⁸⁴⁵¹⁰⁹ is an apocalyptic number.

It is an amenable number.

845109 is a deficient number, since it is larger than the sum of its proper divisors (375617).

845109 is a wasteful number, since it uses less digits than its factorization.

845109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93907 (or 93904 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 845109 is about 919.2981018146. The cubic root of 845109 is about 94.5447843495.

The spelling of 845109 in words is "eight hundred forty-five thousand, one hundred nine".