2001642641 has 4 divisors (see below), whose sum is σ = 2006924400. Its totient is φ = 1996360884.

The previous prime is 2001642583. The next prime is 2001642683. The reversal of 2001642641 is 1462461002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2001642641 - 2¹⁸ = 2001380497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001642641.

It is not an unprimeable number, because it can be changed into a prime (2001642541) 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, 2640311 + ... + 2641068.

It is an arithmetic number, because the mean of its divisors is an integer number (501731100).

Almost surely, 2^2001642641 is an apocalyptic number.

It is an amenable number.

2001642641 is a deficient number, since it is larger than the sum of its proper divisors (5281759).

2001642641 is an equidigital number, since it uses as much as digits as its factorization.

2001642641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5281758.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 2001642641 is about 44739.7210652905. The cubic root of 2001642641 is about 1260.2658885000.

The spelling of 2001642641 in words is "two billion, one million, six hundred forty-two thousand, six hundred forty-one".