1231440044323 has 4 divisors (see below), whose sum is σ = 1231451327008. Its totient is φ = 1231428761640.

The previous prime is 1231440044311. The next prime is 1231440044363. The reversal of 1231440044323 is 3234400441321.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231440044323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231440044363) 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, 5476011 + ... + 5696452.

It is an arithmetic number, because the mean of its divisors is an integer number (307862831752).

Almost surely, 2^{1231440044323} is an apocalyptic number.

1231440044323 is a deficient number, since it is larger than the sum of its proper divisors (11282685).

1231440044323 is a wasteful number, since it uses less digits than its factorization.

1231440044323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11282684.

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 1231440044323 its reverse (3234400441321), we get a palindrome (4465840485644).

The spelling of 1231440044323 in words is "one trillion, two hundred thirty-one billion, four hundred forty million, forty-four thousand, three hundred twenty-three".