2001001203 has 12 divisors (see below), whose sum is σ = 2908069320. Its totient is φ = 1325815776.

The previous prime is 2001001183. The next prime is 2001001241. The reversal of 2001001203 is 3021001002.

It is a happy number.

It is not a de Polignac number, because 2001001203 - 2¹⁴ = 2000984819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (2001001243) 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 11 ways as a sum of consecutive naturals, for example, 680538 + ... + 683471.

It is an arithmetic number, because the mean of its divisors is an integer number (242339110).

Almost surely, 2^2001001203 is an apocalyptic number.

2001001203 is a deficient number, since it is larger than the sum of its proper divisors (907068117).

2001001203 is a wasteful number, since it uses less digits than its factorization.

2001001203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364178 (or 1364175 counting only the distinct ones).

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

The square root of 2001001203 is about 44732.5519392757. The cubic root of 2001001203 is about 1260.1312542784.

Adding to 2001001203 its reverse (3021001002), we get a palindrome (5022002205).

The spelling of 2001001203 in words is "two billion, one million, one thousand, two hundred three".