31020103128 has 128 divisors (see below), whose sum is σ = 95465963520. Its totient is φ = 8204042880.

The previous prime is 31020103123. The next prime is 31020103181. The reversal of 31020103128 is 82130102013.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020103123) 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 31 ways as a sum of consecutive naturals, for example, 9700 + ... + 249267.

It is an arithmetic number, because the mean of its divisors is an integer number (745827840).

Almost surely, 2^31020103128 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 31020103128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47732981760).

31020103128 is an abundant number, since it is smaller than the sum of its proper divisors (64445860392).

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

31020103128 is a wasteful number, since it uses less digits than its factorization.

31020103128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259037 (or 259033 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The spelling of 31020103128 in words is "thirty-one billion, twenty million, one hundred three thousand, one hundred twenty-eight".