2001231 has 12 divisors (see below), whose sum is σ = 2906280. Its totient is φ = 1326960.

The previous prime is 2001229. The next prime is 2001247. The reversal of 2001231 is 1321002.

It is a happy number.

It is not a de Polignac number, because 2001231 - 2¹ = 2001229 is a prime.

It is a super-2 number, since 2×2001231² = 8009851030722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1576 + ... + 2546.

It is an arithmetic number, because the mean of its divisors is an integer number (242190).

2^2001231 is an apocalyptic number.

2001231 is a deficient number, since it is larger than the sum of its proper divisors (905049).

2001231 is a wasteful number, since it uses less digits than its factorization.

2001231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206 (or 1203 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 2001231 is about 1414.6487196474. The cubic root of 2001231 is about 126.0179490681.

Adding to 2001231 its reverse (1321002), we get a palindrome (3322233).

It can be divided in two parts, 200 and 1231, that added together give a triangular number (1431 = T₅₃).

The spelling of 2001231 in words is "two million, one thousand, two hundred thirty-one".