131131445 has 12 divisors (see below), whose sum is σ = 166077900. Its totient is φ = 99382464.

The previous prime is 131131439. The next prime is 131131447. The reversal of 131131445 is 544131131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 41242084 + 89889361 = 6422^2 + 9481^2 .

It is not a de Polignac number, because 131131445 - 2¹⁸ = 130869301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131131445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131131447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34520 + ... + 38129.

It is an arithmetic number, because the mean of its divisors is an integer number (13839825).

Almost surely, 2^131131445 is an apocalyptic number.

It is an amenable number.

131131445 is a deficient number, since it is larger than the sum of its proper divisors (34946455).

131131445 is an equidigital number, since it uses as much as digits as its factorization.

131131445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72692 (or 72673 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 131131445 is about 11451.2639040413. The cubic root of 131131445 is about 508.0451178747.

Adding to 131131445 its reverse (544131131), we get a palindrome (675262576).

The spelling of 131131445 in words is "one hundred thirty-one million, one hundred thirty-one thousand, four hundred forty-five".