1311032320044 has 96 divisors (see below), whose sum is σ = 3179254848000. Its totient is φ = 419986861056.

The previous prime is 1311032320021. The next prime is 1311032320049. The reversal of 1311032320044 is 4400232301131.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1311032319996 and 1311032320023.

It is not an unprimeable number, because it can be changed into a prime (1311032320049) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66140367 + ... + 66160185.

It is an arithmetic number, because the mean of its divisors is an integer number (33117238000).

Almost surely, 2^{1311032320044} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311032320044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1589627424000).

1311032320044 is an abundant number, since it is smaller than the sum of its proper divisors (1868222527956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311032320044 is a wasteful number, since it uses less digits than its factorization.

1311032320044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20727 (or 20725 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 1311032320044 its reverse (4400232301131), we get a palindrome (5711264621175).

The spelling of 1311032320044 in words is "one trillion, three hundred eleven billion, thirty-two million, three hundred twenty thousand, forty-four".