131223500 has 72 divisors (see below), whose sum is σ = 302885856. Its totient is φ = 49658400.

The previous prime is 131223461. The next prime is 131223511. The reversal of 131223500 is 5322131.

131223500 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180137 + ... + 180863.

It is an arithmetic number, because the mean of its divisors is an integer number (4206748).

Almost surely, 2^131223500 is an apocalyptic number.

131223500 is a gapful number since it is divisible by the number (10) 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 131223500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151442928).

131223500 is an abundant number, since it is smaller than the sum of its proper divisors (171662356).

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

131223500 is a wasteful number, since it uses less digits than its factorization.

131223500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784 (or 753 counting only the distinct ones).

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

The square root of 131223500 is about 11455.2826241870. The cubic root of 131223500 is about 508.1639735612.

Adding to 131223500 its reverse (5322131), we get a palindrome (136545631).

The spelling of 131223500 in words is "one hundred thirty-one million, two hundred twenty-three thousand, five hundred".