131505734441 has 4 divisors (see below), whose sum is σ = 133307182932. Its totient is φ = 129704285952.

The previous prime is 131505734389. The next prime is 131505734473. The reversal of 131505734441 is 144437505131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 144437505131 = 7883 ⋅18322657.

It can be written as a sum of positive squares in 2 ways, for example, as 49836097600 + 81669636841 = 223240^2 + 285779^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131505734441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131505734395 and 131505734404.

It is not an unprimeable number, because it can be changed into a prime (131505764441) 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, 900724136 + ... + 900724281.

It is an arithmetic number, because the mean of its divisors is an integer number (33326795733).

Almost surely, 2^131505734441 is an apocalyptic number.

It is an amenable number.

131505734441 is a deficient number, since it is larger than the sum of its proper divisors (1801448491).

131505734441 is an equidigital number, since it uses as much as digits as its factorization.

131505734441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1801448490.

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 131505734441 in words is "one hundred thirty-one billion, five hundred five million, seven hundred thirty-four thousand, four hundred forty-one".