131442561 has 8 divisors (see below), whose sum is σ = 194729760. Its totient is φ = 87628356.

The previous prime is 131442517. The next prime is 131442583. The reversal of 131442561 is 165244131.

It is a happy number.

It is not a de Polignac number, because 131442561 - 2⁹ = 131442049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4868243 = 131442561 / (1 + 3 + 1 + 4 + 4 + 2 + 5 + 6 + 1).

It is not an unprimeable number, because it can be changed into a prime (131442061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2434095 + ... + 2434148.

It is an arithmetic number, because the mean of its divisors is an integer number (24341220).

Almost surely, 2^131442561 is an apocalyptic number.

It is an amenable number.

131442561 is a deficient number, since it is larger than the sum of its proper divisors (63287199).

131442561 is an equidigital number, since it uses as much as digits as its factorization.

131442561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4868252 (or 4868246 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 131442561 is about 11464.8402082192. The cubic root of 131442561 is about 508.4465881369.

Adding to 131442561 its reverse (165244131), we get a palindrome (296686692).

The spelling of 131442561 in words is "one hundred thirty-one million, four hundred forty-two thousand, five hundred sixty-one".