2031643 has 4 divisors (see below), whose sum is σ = 2057440. Its totient is φ = 2005848.

The previous prime is 2031611. The next prime is 2031671. The reversal of 2031643 is 3461302.

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 2031643 - 2⁵ = 2031611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2031643.

It is not an unprimeable number, because it can be changed into a prime (2031443) 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, 12780 + ... + 12937.

It is an arithmetic number, because the mean of its divisors is an integer number (514360).

2^2031643 is an apocalyptic number.

2031643 is a deficient number, since it is larger than the sum of its proper divisors (25797).

2031643 is an equidigital number, since it uses as much as digits as its factorization.

2031643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25796.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 2031643 is about 1425.3571482264. The cubic root of 2031643 is about 126.6530925743.

Adding to 2031643 its reverse (3461302), we get a palindrome (5492945).

The spelling of 2031643 in words is "two million, thirty-one thousand, six hundred forty-three".