201001 has 8 divisors (see below), whose sum is σ = 216000. Its totient is φ = 186480.

The previous prime is 200989. The next prime is 201007. The reversal of 201001 is 100102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201001 - 2¹¹ = 198953 is a prime.

It is an Ulam number.

It is a Duffinian number.

201001 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (201007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1275 + ... + 1423.

It is an arithmetic number, because the mean of its divisors is an integer number (27000).

2²⁰¹⁰⁰¹ is an apocalyptic number.

201001 is the 201-st centered decagonal number.

It is an amenable number.

201001 is a deficient number, since it is larger than the sum of its proper divisors (14999).

201001 is a wasteful number, since it uses less digits than its factorization.

201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239.

The product of its (nonzero) digits is 2, while the sum is 4.

The square root of 201001 is about 448.3313506772. The cubic root of 201001 is about 58.5777571701.

Adding to 201001 its reverse (100102), we get a palindrome (301103).

Multiplying 201001 by its reverse (100102), we get a palindrome (20120602102).

The spelling of 201001 in words is "two hundred one thousand, one", and thus it is an iban number.