2001123001 has 16 divisors (see below), whose sum is σ = 2069729280. Its totient is φ = 1933842960.

The previous prime is 2001122987. The next prime is 2001123013. The reversal of 2001123001 is 1003211002.

It is a cyclic number.

It is not a de Polignac number, because 2001123001 - 2¹³ = 2001114809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001123031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2542330 + ... + 2543116.

It is an arithmetic number, because the mean of its divisors is an integer number (129358080).

Almost surely, 2^2001123001 is an apocalyptic number.

It is an amenable number.

2001123001 is a deficient number, since it is larger than the sum of its proper divisors (68606279).

2001123001 is an equidigital number, since it uses as much as digits as its factorization.

2001123001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524.

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

The square root of 2001123001 is about 44733.9133208799. The cubic root of 2001123001 is about 1260.1568212050.

Adding to 2001123001 its reverse (1003211002), we get a palindrome (3004334003).

The spelling of 2001123001 in words is "two billion, one million, one hundred twenty-three thousand, one".