2001001002 has 128 divisors (see below), whose sum is σ = 5395396608. Its totient is φ = 477792000.

The previous prime is 2001000977. The next prime is 2001001003.

It is a happy number.

2001001002 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is not an unprimeable number, because it can be changed into a prime (2001001003) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1903377 + ... + 1904427.

It is an arithmetic number, because the mean of its divisors is an integer number (42151536).

Almost surely, 2^2001001002 is an apocalyptic number.

2001001002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2001001002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2697698304).

2001001002 is an abundant number, since it is smaller than the sum of its proper divisors (3394395606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2001001002 is a wasteful number, since it uses less digits than its factorization.

2001001002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1404.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 2001001002 is about 44732.5496925896. The cubic root of 2001001002 is about 1260.1312120851.

It can be divided in two parts, 200100 and 1002, that added together give a palindrome (201102).

The spelling of 2001001002 in words is "two billion, one million, one thousand, two".