31243300000000 has 324 divisors, whose sum is σ = 85045526769168. Its totient is φ = 11360800000000.

The previous prime is 31243299999943. The next prime is 31243300000019. The reversal of 31243300000000 is 334213.

It is a super-2 number, since 2×31243300000000² (a number of 28 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 31243300000000.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1099985799 + ... + 1100014201.

It is an arithmetic number, because the mean of its divisors is an integer number (262486193732).

Almost surely, 2^{31243300000000} 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 31243300000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42522763384584).

31243300000000 is an abundant number, since it is smaller than the sum of its proper divisors (53802226769168).

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

31243300000000 is an frugal number, since it uses more digits than its factorization.

31243300000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28470 (or 28421 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 31243300000000 its reverse (334213), we get a palindrome (31243300334213).

The spelling of 31243300000000 in words is "thirty-one trillion, two hundred forty-three billion, three hundred million", and thus it is an aban number.