201123189 has 16 divisors (see below), whose sum is σ = 313643200. Its totient is φ = 127024848.

The previous prime is 201123187. The next prime is 201123229. The reversal of 201123189 is 981321102.

It is not a de Polignac number, because 201123189 - 2¹ = 201123187 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201123187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195514 + ... + 196539.

It is an arithmetic number, because the mean of its divisors is an integer number (19602700).

Almost surely, 2^201123189 is an apocalyptic number.

It is an amenable number.

201123189 is a deficient number, since it is larger than the sum of its proper divisors (112520011).

201123189 is a wasteful number, since it uses less digits than its factorization.

201123189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392081 (or 392075 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 201123189 is about 14181.7907543441. The cubic root of 201123189 is about 585.8962461963.

It can be divided in two parts, 2011 and 23189, that added together give a triangular number (25200 = T₂₂₄).

The spelling of 201123189 in words is "two hundred one million, one hundred twenty-three thousand, one hundred eighty-nine".