31313122000 has 80 divisors (see below), whose sum is σ = 76423269312. Its totient is φ = 12408105600.

The previous prime is 31313121989. The next prime is 31313122013. The reversal of 31313122000 is 22131313.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140839 + ... + 287161.

Almost surely, 2^31313122000 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 31313122000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38211634656).

31313122000 is an abundant number, since it is smaller than the sum of its proper divisors (45110147312).

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

31313122000 is a wasteful number, since it uses less digits than its factorization.

31313122000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146453 (or 146437 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31313122000 its reverse (22131313), we get a palindrome (31335253313).

The spelling of 31313122000 in words is "thirty-one billion, three hundred thirteen million, one hundred twenty-two thousand".