2002001001 has 32 divisors (see below), whose sum is σ = 3584007168. Its totient is φ = 959999040.

The previous prime is 2002000969. The next prime is 2002001021. The reversal of 2002001001 is 1001002002.

It is a happy number.

It is not a de Polignac number, because 2002001001 - 2⁵ = 2002000969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2002001021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 330331 + ... + 336336.

It is an arithmetic number, because the mean of its divisors is an integer number (112000224).

Almost surely, 2^2002001001 is an apocalyptic number.

2002001001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2002001001 is a deficient number, since it is larger than the sum of its proper divisors (1582006167).

2002001001 is a wasteful number, since it uses less digits than its factorization.

2002001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666701.

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

The square root of 2002001001 is about 44743.7258283214. The cubic root of 2002001001 is about 1260.3410937214.

Adding to 2002001001 its reverse (1001002002), we get a palindrome (3003003003).

The spelling of 2002001001 in words is "two billion, two million, one thousand, one".