2001223291 has 4 divisors (see below), whose sum is σ = 2013206832. Its totient is φ = 1989239752.

The previous prime is 2001223283. The next prime is 2001223297. The reversal of 2001223291 is 1923221002.

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 2001223291 - 2³ = 2001223283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001223297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5991520 + ... + 5991853.

It is an arithmetic number, because the mean of its divisors is an integer number (503301708).

Almost surely, 2^2001223291 is an apocalyptic number.

2001223291 is a deficient number, since it is larger than the sum of its proper divisors (11983541).

2001223291 is a wasteful number, since it uses less digits than its factorization.

2001223291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11983540.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 2001223291 is about 44735.0342684568. The cubic root of 2001223291 is about 1260.1778725540.

Adding to 2001223291 its reverse (1923221002), we get a palindrome (3924444293).

The spelling of 2001223291 in words is "two billion, one million, two hundred twenty-three thousand, two hundred ninety-one".