31243300000 has 144 divisors (see below), whose sum is σ = 83875194144. Its totient is φ = 11360800000.

The previous prime is 31243299991. The next prime is 31243300013. The reversal of 31243300000 is 334213.

It is a super-2 number, since 2×31243300000² (a number of 22 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 1085799 + ... + 1114201.

It is an arithmetic number, because the mean of its divisors is an integer number (582466626).

Almost surely, 2^31243300000 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 31243300000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41937597072).

31243300000 is an abundant number, since it is smaller than the sum of its proper divisors (52631894144).

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

31243300000 is an equidigital number, since it uses as much as digits as its factorization.

31243300000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28449 (or 28421 counting only the distinct ones).

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

Adding to 31243300000 its reverse (334213), we get a palindrome (31243634213).

The spelling of 31243300000 in words is "thirty-one billion, two hundred forty-three million, three hundred thousand".