1231031111120 has 40 divisors (see below), whose sum is σ = 2862385295616. Its totient is φ = 492371504768.

The previous prime is 1231031111099. The next prime is 1231031111129. The reversal of 1231031111120 is 211111301321.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231031111129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337829 + ... + 1605051.

Almost surely, 2^{1231031111120} is an apocalyptic number.

1231031111120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231031111120 is an abundant number, since it is smaller than the sum of its proper divisors (1631354184496).

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

1231031111120 is a wasteful number, since it uses less digits than its factorization.

1231031111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279379 (or 1279373 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 1231031111120 its reverse (211111301321), we get a palindrome (1442142412441).

The spelling of 1231031111120 in words is "one trillion, two hundred thirty-one billion, thirty-one million, one hundred eleven thousand, one hundred twenty".