201801 has 8 divisors (see below), whose sum is σ = 271584. Its totient is φ = 133280.

The previous prime is 201797. The next prime is 201809. The reversal of 201801 is 108102.

It is a happy number.

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 201801 - 2² = 201797 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201809) 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, 166 + ... + 656.

It is an arithmetic number, because the mean of its divisors is an integer number (33948).

2²⁰¹⁸⁰¹ is an apocalyptic number.

It is an amenable number.

201801 is a deficient number, since it is larger than the sum of its proper divisors (69783).

201801 is a wasteful number, since it uses less digits than its factorization.

201801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 201801 is about 449.2226619395. Note that the first 3 decimals coincide. The cubic root of 201801 is about 58.6553690079.

Adding to 201801 its reverse (108102), we get a palindrome (309903).

The spelling of 201801 in words is "two hundred one thousand, eight hundred one".