2001431 has 4 divisors (see below), whose sum is σ = 2004912. Its totient is φ = 1997952.

The previous prime is 2001421. The next prime is 2001449. The reversal of 2001431 is 1341002.

It is a happy number.

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 2001431 - 2¹⁴ = 1985047 is a prime.

It is a super-2 number, since 2×2001431² = 8011452095522, 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 (2001421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650 + ... + 2103.

It is an arithmetic number, because the mean of its divisors is an integer number (501228).

2^2001431 is an apocalyptic number.

2001431 is a deficient number, since it is larger than the sum of its proper divisors (3481).

2001431 is an equidigital number, since it uses as much as digits as its factorization.

2001431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3480.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2001431 is about 1414.7194068083. The cubic root of 2001431 is about 126.0221469427.

Adding to 2001431 its reverse (1341002), we get a palindrome (3342433).

The spelling of 2001431 in words is "two million, one thousand, four hundred thirty-one".