1231352331440 has 160 divisors (see below), whose sum is σ = 3586242608640. Its totient is φ = 381978777600.

The previous prime is 1231352331439. The next prime is 1231352331449. The reversal of 1231352331440 is 441332531321.

It is a super-2 number, since 2×1231352331440² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231352331397 and 1231352331406.

It is not an unprimeable number, because it can be changed into a prime (1231352331449) 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, 826076 + ... + 1773444.

It is an arithmetic number, because the mean of its divisors is an integer number (22414016304).

Almost surely, 2^{1231352331440} is an apocalyptic number.

1231352331440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231352331440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1793121304320).

1231352331440 is an abundant number, since it is smaller than the sum of its proper divisors (2354890277200).

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

1231352331440 is a wasteful number, since it uses less digits than its factorization.

1231352331440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947611 (or 947605 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 1231352331440 its reverse (441332531321), we get a palindrome (1672684862761).

The spelling of 1231352331440 in words is "one trillion, two hundred thirty-one billion, three hundred fifty-two million, three hundred thirty-one thousand, four hundred forty".