2001023535 has 48 divisors (see below), whose sum is σ = 3728992896. Its totient is φ = 913614912.

The previous prime is 2001023503. The next prime is 2001023537. The reversal of 2001023535 is 5353201002.

It is not a de Polignac number, because 2001023535 - 2⁵ = 2001023503 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001023537) 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 47 ways as a sum of consecutive naturals, for example, 959604 + ... + 961686.

It is an arithmetic number, because the mean of its divisors is an integer number (77687352).

Almost surely, 2^2001023535 is an apocalyptic number.

2001023535 is a deficient number, since it is larger than the sum of its proper divisors (1727969361).

2001023535 is a wasteful number, since it uses less digits than its factorization.

2001023535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3412 (or 3405 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 2001023535 is about 44732.8015554582. The cubic root of 2001023535 is about 1260.1359421227.

Adding to 2001023535 its reverse (5353201002), we get a palindrome (7354224537).

The spelling of 2001023535 in words is "two billion, one million, twenty-three thousand, five hundred thirty-five".