1231444444445 has 4 divisors (see below), whose sum is σ = 1477733333340. Its totient is φ = 985155555552.

The previous prime is 1231444444441. The next prime is 1231444444463. The reversal of 1231444444445 is 5444444441321.

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 328904544004 + 902539900441 = 573502^2 + 950021^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231444444445 - 2² = 1231444444441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231444444396 and 1231444444405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231444444441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123144444440 + ... + 123144444449.

It is an arithmetic number, because the mean of its divisors is an integer number (369433333335).

Almost surely, 2^{1231444444445} is an apocalyptic number.

It is an amenable number.

1231444444445 is a deficient number, since it is larger than the sum of its proper divisors (246288888895).

1231444444445 is an equidigital number, since it uses as much as digits as its factorization.

1231444444445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246288888894.

The product of its digits is 1966080, while the sum is 44.

Adding to 1231444444445 its reverse (5444444441321), we get a palindrome (6675888885766).

The spelling of 1231444444445 in words is "one trillion, two hundred thirty-one billion, four hundred forty-four million, four hundred forty-four thousand, four hundred forty-five".