2001311231 has 4 divisors (see below), whose sum is σ = 2014743000. Its totient is φ = 1987879464.

The previous prime is 2001311209. The next prime is 2001311243. The reversal of 2001311231 is 1321131002.

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 2001311231 - 2¹⁴ = 2001294847 is a prime.

It is a super-2 number, since 2×2001311231² = 8010493286653470722, 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 (2001311531) 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, 6715661 + ... + 6715958.

It is an arithmetic number, because the mean of its divisors is an integer number (503685750).

Almost surely, 2^2001311231 is an apocalyptic number.

2001311231 is a deficient number, since it is larger than the sum of its proper divisors (13431769).

2001311231 is a wasteful number, since it uses less digits than its factorization.

2001311231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13431768.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 2001311231 is about 44736.0171562020. The cubic root of 2001311231 is about 1260.1963310005.

Adding to 2001311231 its reverse (1321131002), we get a palindrome (3322442233).

The spelling of 2001311231 in words is "two billion, one million, three hundred eleven thousand, two hundred thirty-one".