231031122102 has 128 divisors (see below), whose sum is σ = 612151603200. Its totient is φ = 63765619200.

The previous prime is 231031122037. The next prime is 231031122107. The reversal of 231031122102 is 201221130132.

231031122102 is a `hidden beast` number, since 231 + 0 + 311 + 22 + 102 = 666.

231031122102 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231031122107) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 55977 + ... + 682052.

It is an arithmetic number, because the mean of its divisors is an integer number (4782434400).

Almost surely, 2^231031122102 is an apocalyptic number.

231031122102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 231031122102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306075801600).

231031122102 is an abundant number, since it is smaller than the sum of its proper divisors (381120481098).

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

231031122102 is a wasteful number, since it uses less digits than its factorization.

231031122102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738099 (or 738093 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 231031122102 its reverse (201221130132), we get a palindrome (432252252234).

The spelling of 231031122102 in words is "two hundred thirty-one billion, thirty-one million, one hundred twenty-two thousand, one hundred two".