31229135388 has 216 divisors, whose sum is σ = 94548263600. Its totient is φ = 8905628160.

The previous prime is 31229135363. The next prime is 31229135401. The reversal of 31229135388 is 88353192213.

31229135388 is a `hidden beast` number, since 3 + 1 + 2 + 291 + 353 + 8 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3772518 + ... + 3780786.

Almost surely, 2^31229135388 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 31229135388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47274131800).

31229135388 is an abundant number, since it is smaller than the sum of its proper divisors (63319128212).

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

31229135388 is a wasteful number, since it uses less digits than its factorization.

31229135388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8338 (or 8302 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The spelling of 31229135388 in words is "thirty-one billion, two hundred twenty-nine million, one hundred thirty-five thousand, three hundred eighty-eight".