131523823 has 4 divisors (see below), whose sum is σ = 131547528. Its totient is φ = 131500120.

The previous prime is 131523809. The next prime is 131523827. The reversal of 131523823 is 328325131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131523823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131523791 and 131523800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131523827) 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 3 ways as a sum of consecutive naturals, for example, 1440 + ... + 16282.

It is an arithmetic number, because the mean of its divisors is an integer number (32886882).

Almost surely, 2^131523823 is an apocalyptic number.

131523823 is a deficient number, since it is larger than the sum of its proper divisors (23705).

131523823 is an equidigital number, since it uses as much as digits as its factorization.

131523823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23704.

The product of its digits is 4320, while the sum is 28.

The square root of 131523823 is about 11468.3836263006. The cubic root of 131523823 is about 508.5513458721.

Adding to 131523823 its reverse (328325131), we get a palindrome (459848954).

The spelling of 131523823 in words is "one hundred thirty-one million, five hundred twenty-three thousand, eight hundred twenty-three".