31123120000 has 320 divisors, whose sum is σ = 89380764000. Its totient is φ = 10570752000.

The previous prime is 31123119997. The next prime is 31123120001. The reversal of 31123120000 is 2132113.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123120001) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 83439814 + ... + 83440186.

Almost surely, 2^31123120000 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 31123120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44690382000).

31123120000 is an abundant number, since it is smaller than the sum of its proper divisors (58257644000).

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

31123120000 is an equidigital number, since it uses as much as digits as its factorization.

31123120000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563 (or 536 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31123120000 its reverse (2132113), we get a palindrome (31125252113).

The spelling of 31123120000 in words is "thirty-one billion, one hundred twenty-three million, one hundred twenty thousand".