201859 has 4 divisors (see below), whose sum is σ = 230704. Its totient is φ = 173016.

The previous prime is 201847. The next prime is 201881. The reversal of 201859 is 958102.

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 201859 - 2⁵ = 201827 is a prime.

It is a Duffinian number.

201859 is a lucky 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 3 ways as a sum of consecutive naturals, for example, 14412 + ... + 14425.

It is an arithmetic number, because the mean of its divisors is an integer number (57676).

2²⁰¹⁸⁵⁹ is an apocalyptic number.

201859 is a deficient number, since it is larger than the sum of its proper divisors (28845).

201859 is an equidigital number, since it uses as much as digits as its factorization.

201859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28844.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 201859 is about 449.2872132612. The cubic root of 201859 is about 58.6609878858.

The spelling of 201859 in words is "two hundred one thousand, eight hundred fifty-nine".