31123242200 has 96 divisors (see below), whose sum is σ = 73209108960. Its totient is φ = 12303974400.

The previous prime is 31123242193. The next prime is 31123242209. The reversal of 31123242200 is 224232113.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123242209) 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, 13203422 + ... + 13205778.

It is an arithmetic number, because the mean of its divisors is an integer number (762594885).

Almost surely, 2^31123242200 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 31123242200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36604554480).

31123242200 is an abundant number, since it is smaller than the sum of its proper divisors (42085866760).

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

31123242200 is a wasteful number, since it uses less digits than its factorization.

31123242200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117 (or 3108 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31123242200 its reverse (224232113), we get a palindrome (31347474313).

The spelling of 31123242200 in words is "thirty-one billion, one hundred twenty-three million, two hundred forty-two thousand, two hundred".