131444443421 has 4 divisors (see below), whose sum is σ = 131455420992. Its totient is φ = 131433465852.

The previous prime is 131444443399. The next prime is 131444443439. The reversal of 131444443421 is 124344444131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131444443421 - 2¹⁸ = 131444181277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131444443121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5470805 + ... + 5494778.

It is an arithmetic number, because the mean of its divisors is an integer number (32863855248).

Almost surely, 2^131444443421 is an apocalyptic number.

It is an amenable number.

131444443421 is a deficient number, since it is larger than the sum of its proper divisors (10977571).

131444443421 is a wasteful number, since it uses less digits than its factorization.

131444443421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10977570.

The product of its digits is 73728, while the sum is 35.

Adding to 131444443421 its reverse (124344444131), we get a palindrome (255788887552).

The spelling of 131444443421 in words is "one hundred thirty-one billion, four hundred forty-four million, four hundred forty-three thousand, four hundred twenty-one".