31160921000 has 128 divisors (see below), whose sum is σ = 82112209920. Its totient is φ = 10965600000.

The previous prime is 31160920997. The next prime is 31160921009. The reversal of 31160921000 is 12906113.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31160921009) 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, 295310 + ... + 386690.

It is an arithmetic number, because the mean of its divisors is an integer number (641501640).

Almost surely, 2^31160921000 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 31160921000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41056104960).

31160921000 is an abundant number, since it is smaller than the sum of its proper divisors (50951288920).

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

31160921000 is a wasteful number, since it uses less digits than its factorization.

31160921000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91444 (or 91430 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 31160921000 in words is "thirty-one billion, one hundred sixty million, nine hundred twenty-one thousand".