1231531044140 has 96 divisors (see below), whose sum is σ = 2670125762304. Its totient is φ = 476832061440.

The previous prime is 1231531044119. The next prime is 1231531044143. The reversal of 1231531044140 is 414401351321.

It is not an unprimeable number, because it can be changed into a prime (1231531044143) 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 31 ways as a sum of consecutive naturals, for example, 59274794 + ... + 59295566.

It is an arithmetic number, because the mean of its divisors is an integer number (27813810024).

Almost surely, 2^{1231531044140} is an apocalyptic number.

1231531044140 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 1231531044140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1335062881152).

1231531044140 is an abundant number, since it is smaller than the sum of its proper divisors (1438594718164).

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

1231531044140 is a wasteful number, since it uses less digits than its factorization.

1231531044140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21387 (or 21385 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 1231531044140 its reverse (414401351321), we get a palindrome (1645932395461).

The spelling of 1231531044140 in words is "one trillion, two hundred thirty-one billion, five hundred thirty-one million, forty-four thousand, one hundred forty".