31123200000 has 288 divisors, whose sum is σ = 103776014160. Its totient is φ = 8294400000.

The previous prime is 31123199953. The next prime is 31123200001. The reversal of 31123200000 is 232113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123200001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19199190 + ... + 19200810.

Almost surely, 2^31123200000 is an apocalyptic number.

31123200000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31123200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51888007080).

31123200000 is an abundant number, since it is smaller than the sum of its proper divisors (72652814160).

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

31123200000 is an frugal number, since it uses more digits than its factorization.

31123200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671 (or 1631 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 31123200000 its reverse (232113), we get a palindrome (31123432113).

The spelling of 31123200000 in words is "thirty-one billion, one hundred twenty-three million, two hundred thousand".