1845121 has 4 divisors (see below), whose sum is σ = 1848132. Its totient is φ = 1842112.

The previous prime is 1845119. The next prime is 1845133. The reversal of 1845121 is 1215481.

1845121 = 960² + 961².

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 923521 + 921600 = 961^2 + 960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1845121 - 2¹ = 1845119 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1845092 and 1845101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1845161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220 + ... + 1933.

It is an arithmetic number, because the mean of its divisors is an integer number (462033).

2^1845121 is an apocalyptic number.

1845121 is the 961-st centered square number.

It is an amenable number.

1845121 is a deficient number, since it is larger than the sum of its proper divisors (3011).

1845121 is an equidigital number, since it uses as much as digits as its factorization.

1845121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3010.

The product of its digits is 320, while the sum is 22.

The square root of 1845121 is about 1358.3523107059. The cubic root of 1845121 is about 122.6520893135.

The spelling of 1845121 in words is "one million, eight hundred forty-five thousand, one hundred twenty-one".