2001002131231 has 4 divisors (see below), whose sum is σ = 2001177009592. Its totient is φ = 2000827252872.

The previous prime is 2001002131201. The next prime is 2001002131237. The reversal of 2001002131231 is 1321312001002.

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 2001002131231 - 2¹⁵ = 2001002098463 is a prime.

It is a super-2 number, since 2×2001002131231² (a number of 25 digits) 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 (2001002131237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87422016 + ... + 87444901.

It is an arithmetic number, because the mean of its divisors is an integer number (500294252398).

Almost surely, 2^{2001002131231} is an apocalyptic number.

2001002131231 is a deficient number, since it is larger than the sum of its proper divisors (174878361).

2001002131231 is a wasteful number, since it uses less digits than its factorization.

2001002131231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174878360.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 2001002131231 its reverse (1321312001002), we get a palindrome (3322314132233).

The spelling of 2001002131231 in words is "two trillion, one billion, two million, one hundred thirty-one thousand, two hundred thirty-one".