201123503 has 16 divisors (see below), whose sum is σ = 232165440. Its totient is φ = 170670336.

The previous prime is 201123479. The next prime is 201123509. The reversal of 201123503 is 305321102.

It is a cyclic number.

It is not a de Polignac number, because 201123503 - 2²² = 196929199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201123509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 516833 + ... + 517221.

It is an arithmetic number, because the mean of its divisors is an integer number (14510340).

Almost surely, 2^201123503 is an apocalyptic number.

201123503 is a deficient number, since it is larger than the sum of its proper divisors (31041937).

201123503 is a wasteful number, since it uses less digits than its factorization.

201123503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 201123503 is about 14181.8018248740. The cubic root of 201123503 is about 585.8965511029.

Adding to 201123503 its reverse (305321102), we get a palindrome (506444605).

The spelling of 201123503 in words is "two hundred one million, one hundred twenty-three thousand, five hundred three".