2001211031 has 4 divisors (see below), whose sum is σ = 2001998064. Its totient is φ = 2000424000.

The previous prime is 2001211027. The next prime is 2001211067. The reversal of 2001211031 is 1301121002.

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 2001211031 - 2² = 2001211027 is a prime.

It is a super-2 number, since 2×2001211031² = 8009691181192165922, 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 (2001211631) 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, 389690 + ... + 394791.

It is an arithmetic number, because the mean of its divisors is an integer number (500499516).

Almost surely, 2^2001211031 is an apocalyptic number.

2001211031 is a deficient number, since it is larger than the sum of its proper divisors (787033).

2001211031 is an equidigital number, since it uses as much as digits as its factorization.

2001211031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787032.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 2001211031 is about 44734.8972391801. The cubic root of 2001211031 is about 1260.1752991593.

Adding to 2001211031 its reverse (1301121002), we get a palindrome (3302332033).

The spelling of 2001211031 in words is "two billion, one million, two hundred eleven thousand, thirty-one".