2001313231 has 4 divisors (see below), whose sum is σ = 2039073912. Its totient is φ = 1963552552.

The previous prime is 2001313213. The next prime is 2001313261. The reversal of 2001313231 is 1323131002.

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 2001313231 - 2⁷ = 2001313103 is a prime.

It is a super-2 number, since 2×2001313231² = 8010509297151318722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001313201) 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, 18880261 + ... + 18880366.

It is an arithmetic number, because the mean of its divisors is an integer number (509768478).

Almost surely, 2^2001313231 is an apocalyptic number.

2001313231 is a deficient number, since it is larger than the sum of its proper divisors (37760681).

2001313231 is an equidigital number, since it uses as much as digits as its factorization.

2001313231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37760680.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 2001313231 is about 44736.0395095498. The cubic root of 2001313231 is about 1260.1967507906.

Adding to 2001313231 its reverse (1323131002), we get a palindrome (3324444233).

The spelling of 2001313231 in words is "two billion, one million, three hundred thirteen thousand, two hundred thirty-one".