31131330102 has 64 divisors (see below), whose sum is σ = 72890496000. Its totient is φ = 9821676384.

The previous prime is 31131330077. The next prime is 31131330107. The reversal of 31131330102 is 20103313113.

It is a happy number.

31131330102 is a `hidden beast` number, since 311 + 313 + 30 + 10 + 2 = 666.

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 (31131330107) 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, 1117924 + ... + 1145432.

It is an arithmetic number, because the mean of its divisors is an integer number (1138914000).

Almost surely, 2^31131330102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31131330102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36445248000).

31131330102 is an abundant number, since it is smaller than the sum of its proper divisors (41759165898).

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

31131330102 is a wasteful number, since it uses less digits than its factorization.

31131330102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28642 (or 28636 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31131330102 its reverse (20103313113), we get a palindrome (51234643215).

The spelling of 31131330102 in words is "thirty-one billion, one hundred thirty-one million, three hundred thirty thousand, one hundred two".