201123 has 20 divisors (see below), whose sum is σ = 325248. Its totient is φ = 123120.

The previous prime is 201121. The next prime is 201139. The reversal of 201123 is 321102.

It is a happy number.

It is not a de Polignac number, because 201123 - 2¹ = 201121 is a prime.

It is a super-2 number, since 2×201123² = 80900922258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (201121) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 958 + ... + 1148.

2²⁰¹¹²³ is an apocalyptic number.

201123 is a deficient number, since it is larger than the sum of its proper divisors (124125).

201123 is a wasteful number, since it uses less digits than its factorization.

201123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 201123 is about 448.4673901188. The cubic root of 201123 is about 58.5896062670.

Adding to 201123 its reverse (321102), we get a palindrome (522225).

It can be divided in two parts, 201 and 123, that added together give a square (324 = 18²).

The spelling of 201123 in words is "two hundred one thousand, one hundred twenty-three", and thus it is an iban number.