131324444561 has 4 divisors (see below), whose sum is σ = 131325187392. Its totient is φ = 131323701732.

The previous prime is 131324444543. The next prime is 131324444569. The reversal of 131324444561 is 165444423131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 165444423131 = 13 ⋅12726494087.

It is a cyclic number.

It is not a de Polignac number, because 131324444561 - 2¹⁴ = 131324428177 is a prime.

It is a super-2 number, since 2×131324444561² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131324444569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63620 + ... + 516426.

It is an arithmetic number, because the mean of its divisors is an integer number (32831296848).

Almost surely, 2^131324444561 is an apocalyptic number.

It is an amenable number.

131324444561 is a deficient number, since it is larger than the sum of its proper divisors (742831).

131324444561 is an equidigital number, since it uses as much as digits as its factorization.

131324444561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742830.

The product of its digits is 138240, while the sum is 38.

Adding to 131324444561 its reverse (165444423131), we get a palindrome (296768867692).

The spelling of 131324444561 in words is "one hundred thirty-one billion, three hundred twenty-four million, four hundred forty-four thousand, five hundred sixty-one".