131423545 has 12 divisors (see below), whose sum is σ = 173349540. Its totient is φ = 95580320.

The previous prime is 131423483. The next prime is 131423599. The reversal of 131423545 is 545324131.

It can be written as a sum of positive squares in 2 ways, for example, as 20142144 + 111281401 = 4488^2 + 10549^2 .

It is a de Polignac number, because none of the positive numbers 2^k-131423545 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108010 + ... + 109219.

It is an arithmetic number, because the mean of its divisors is an integer number (14445795).

Almost surely, 2^131423545 is an apocalyptic number.

It is an amenable number.

131423545 is a deficient number, since it is larger than the sum of its proper divisors (41925995).

131423545 is a wasteful number, since it uses less digits than its factorization.

131423545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217256 (or 217245 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 131423545 is about 11464.0108600786. The cubic root of 131423545 is about 508.4220677012.

Adding to 131423545 its reverse (545324131), we get a palindrome (676747676).

The spelling of 131423545 in words is "one hundred thirty-one million, four hundred twenty-three thousand, five hundred forty-five".