2001001123 has 8 divisors (see below), whose sum is σ = 2183440896. Its totient is φ = 1818649800.

The previous prime is 2001001109. The next prime is 2001001147. The reversal of 2001001123 is 3211001002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2001001123 - 2⁵ = 2001001091 is a prime.

It is a super-2 number, since 2×2001001123² = 8008010988494522258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001001103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30690 + ... + 70312.

It is an arithmetic number, because the mean of its divisors is an integer number (272930112).

Almost surely, 2^2001001123 is an apocalyptic number.

2001001123 is a deficient number, since it is larger than the sum of its proper divisors (182439773).

2001001123 is a wasteful number, since it uses less digits than its factorization.

2001001123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44225.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 2001001123 is about 44732.5510450723. The cubic root of 2001001123 is about 1260.1312374850.

Adding to 2001001123 its reverse (3211001002), we get a palindrome (5212002125).

The spelling of 2001001123 in words is "two billion, one million, one thousand, one hundred twenty-three".