31131231103120 has 80 divisors (see below), whose sum is σ = 72937635388992. Its totient is φ = 12356587543040.

The previous prime is 31131231103117. The next prime is 31131231103177. The reversal of 31131231103120 is 2130113213113.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 31131231103091 and 31131231103100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165521454 + ... + 165709426.

Almost surely, 2^{31131231103120} 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 31131231103120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36468817694496).

31131231103120 is an abundant number, since it is smaller than the sum of its proper divisors (41806404285872).

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

31131231103120 is a wasteful number, since it uses less digits than its factorization.

31131231103120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203920 (or 203914 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 31131231103120 its reverse (2130113213113), we get a palindrome (33261344316233).

The spelling of 31131231103120 in words is "thirty-one trillion, one hundred thirty-one billion, two hundred thirty-one million, one hundred three thousand, one hundred twenty".