31343773188 has 384 divisors, whose sum is σ = 97995985920. Its totient is φ = 7564492800.

The previous prime is 31343773183. The next prime is 31343773189. The reversal of 31343773188 is 88137734313.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31343773183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 136872258 + ... + 136872486.

It is an arithmetic number, because the mean of its divisors is an integer number (255197880).

Almost surely, 2^31343773188 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 31343773188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48997992960).

31343773188 is an abundant number, since it is smaller than the sum of its proper divisors (66652212732).

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

31343773188 is a wasteful number, since it uses less digits than its factorization.

31343773188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 445 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 48.

The spelling of 31343773188 in words is "thirty-one billion, three hundred forty-three million, seven hundred seventy-three thousand, one hundred eighty-eight".