2001123 has 6 divisors (see below), whose sum is σ = 2890524. Its totient is φ = 1334076.

The previous prime is 2001101. The next prime is 2001127. The reversal of 2001123 is 3211002.

It is a happy number.

It is not a de Polignac number, because 2001123 - 2²⁰ = 952547 is a prime.

It is a super-2 number, since 2×2001123² = 8008986522258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 222347 = 2001123 / (2 + 0 + 0 + 1 + 1 + 2 + 3).

It is not an unprimeable number, because it can be changed into a prime (2001127) 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, 111165 + ... + 111182.

It is an arithmetic number, because the mean of its divisors is an integer number (481754).

2^2001123 is an apocalyptic number.

2001123 is a deficient number, since it is larger than the sum of its proper divisors (889401).

2001123 is a wasteful number, since it uses less digits than its factorization.

2001123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222353 (or 222350 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 2001123 is about 1414.6105471118. The cubic root of 2001123 is about 126.0156820995.

Adding to 2001123 its reverse (3211002), we get a palindrome (5212125).

The spelling of 2001123 in words is "two million, one thousand, one hundred twenty-three".