201789 has 12 divisors (see below), whose sum is σ = 333216. Its totient is φ = 115272.

The previous prime is 201787. The next prime is 201791. The reversal of 201789 is 987102.

201789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (201787) and next prime (201791).

It is not a de Polignac number, because 201789 - 2¹ = 201787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1539 + ... + 1664.

It is an arithmetic number, because the mean of its divisors is an integer number (27768).

2²⁰¹⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

201789 is a deficient number, since it is larger than the sum of its proper divisors (131427).

201789 is a wasteful number, since it uses less digits than its factorization.

201789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216 (or 3213 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 201789 is about 449.2093053355. The cubic root of 201789 is about 58.6542063471.

It can be divided in two parts, 201 and 789, that added together give a triangular number (990 = T₄₄).

The spelling of 201789 in words is "two hundred one thousand, seven hundred eighty-nine".