131321545 has 16 divisors (see below), whose sum is σ = 161228880. Its totient is φ = 102645504.

The previous prime is 131321537. The next prime is 131321569. The reversal of 131321545 is 545123131.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2521744 + 128799801 = 1588^2 + 11349^2 .

It is a cyclic number.

It is not a de Polignac number, because 131321545 - 2³ = 131321537 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 15 ways as a sum of consecutive naturals, for example, 72511 + ... + 74299.

It is an arithmetic number, because the mean of its divisors is an integer number (10076805).

Almost surely, 2^131321545 is an apocalyptic number.

It is an amenable number.

131321545 is a deficient number, since it is larger than the sum of its proper divisors (29907335).

131321545 is a wasteful number, since it uses less digits than its factorization.

131321545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124.

The product of its digits is 1800, while the sum is 25.

The square root of 131321545 is about 11459.5612917773. The cubic root of 131321545 is about 508.2905020498.

Adding to 131321545 its reverse (545123131), we get a palindrome (676444676).

The spelling of 131321545 in words is "one hundred thirty-one million, three hundred twenty-one thousand, five hundred forty-five".