131445123531 has 4 divisors (see below), whose sum is σ = 175260164712. Its totient is φ = 87630082352.

The previous prime is 131445123499. The next prime is 131445123539. The reversal of 131445123531 is 135321544131.

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

It is a cyclic number.

It is not a de Polignac number, because 131445123531 - 2⁵ = 131445123499 is a prime.

It is a super-2 number, since 2×131445123531² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131445123492 and 131445123501.

It is not an unprimeable number, because it can be changed into a prime (131445123539) 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, 21907520586 + ... + 21907520591.

It is an arithmetic number, because the mean of its divisors is an integer number (43815041178).

Almost surely, 2^131445123531 is an apocalyptic number.

131445123531 is a deficient number, since it is larger than the sum of its proper divisors (43815041181).

131445123531 is an equidigital number, since it uses as much as digits as its factorization.

131445123531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43815041180.

The product of its digits is 21600, while the sum is 33.

Adding to 131445123531 its reverse (135321544131), we get a palindrome (266766667662).

The spelling of 131445123531 in words is "one hundred thirty-one billion, four hundred forty-five million, one hundred twenty-three thousand, five hundred thirty-one".