845121 has 16 divisors (see below), whose sum is σ = 1214784. Its totient is φ = 520704.

The previous prime is 845111. The next prime is 845129. The reversal of 845121 is 121548.

845121 = T₂₆ + T₂₇ + ... + T₁₇₁.

It is not a de Polignac number, because 845121 - 2⁹ = 844609 is a prime.

Its product of digits (320) is a multiple of the sum of its prime divisors (320).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 845121.

It is not an unprimeable number, because it can be changed into a prime (845129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3610 + ... + 3836.

It is an arithmetic number, because the mean of its divisors is an integer number (75924).

2⁸⁴⁵¹²¹ is an apocalyptic number.

It is an amenable number.

845121 is a deficient number, since it is larger than the sum of its proper divisors (369663).

845121 is a wasteful number, since it uses less digits than its factorization.

845121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320.

The product of its digits is 320, while the sum is 21.

The square root of 845121 is about 919.3046285100. The cubic root of 845121 is about 94.5452318390.

Adding to 845121 its reverse (121548), we get a palindrome (966669).

The spelling of 845121 in words is "eight hundred forty-five thousand, one hundred twenty-one".