2001231023 has 4 divisors (see below), whose sum is σ = 2183161128. Its totient is φ = 1819300920.

The previous prime is 2001230911. The next prime is 2001231049. The reversal of 2001231023 is 3201321002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2001231023 - 2¹⁴ = 2001214639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001230989 and 2001231007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001231053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90965036 + ... + 90965057.

It is an arithmetic number, because the mean of its divisors is an integer number (545790282).

Almost surely, 2^2001231023 is an apocalyptic number.

2001231023 is a deficient number, since it is larger than the sum of its proper divisors (181930105).

2001231023 is a wasteful number, since it uses less digits than its factorization.

2001231023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181930104.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 2001231023 is about 44735.1206883361. The cubic root of 2001231023 is about 1260.1794955085.

Adding to 2001231023 its reverse (3201321002), we get a palindrome (5202552025).

The spelling of 2001231023 in words is "two billion, one million, two hundred thirty-one thousand, twenty-three".