201123156 has 48 divisors (see below), whose sum is σ = 510333824. Its totient is φ = 61278336.

The previous prime is 201123137. The next prime is 201123187. The reversal of 201123156 is 651321102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9810 + ... + 22326.

Almost surely, 2^201123156 is an apocalyptic number.

201123156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201123156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255166912).

201123156 is an abundant number, since it is smaller than the sum of its proper divisors (309210668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201123156 is a wasteful number, since it uses less digits than its factorization.

201123156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12640 (or 12638 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 201123156 is about 14181.7895908803. The cubic root of 201123156 is about 585.8962141520.

Adding to 201123156 its reverse (651321102), we get a palindrome (852444258).

The spelling of 201123156 in words is "two hundred one million, one hundred twenty-three thousand, one hundred fifty-six".