131128441 has 4 divisors (see below), whose sum is σ = 131963812. Its totient is φ = 130293072.

The previous prime is 131128427. The next prime is 131128453. The reversal of 131128441 is 144821131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 81721600 + 49406841 = 9040^2 + 7029^2 .

It is a cyclic number.

It is not a de Polignac number, because 131128441 - 2²³ = 122739833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131128411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 417450 + ... + 417763.

It is an arithmetic number, because the mean of its divisors is an integer number (32990953).

Almost surely, 2^131128441 is an apocalyptic number.

It is an amenable number.

131128441 is a deficient number, since it is larger than the sum of its proper divisors (835371).

131128441 is an equidigital number, since it uses as much as digits as its factorization.

131128441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835370.

The product of its digits is 768, while the sum is 25.

The square root of 131128441 is about 11451.1327387294. The cubic root of 131128441 is about 508.0412383598.

Adding to 131128441 its reverse (144821131), we get a palindrome (275949572).

The spelling of 131128441 in words is "one hundred thirty-one million, one hundred twenty-eight thousand, four hundred forty-one".