31243101100 has 72 divisors (see below), whose sum is σ = 70900462080. Its totient is φ = 11927657280.

The previous prime is 31243101083. The next prime is 31243101103. The reversal of 31243101100 is 110134213.

It is a super-2 number, since 2×31243101100² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31243101103) 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, 1050231 + ... + 1079569.

It is an arithmetic number, because the mean of its divisors is an integer number (984728640).

Almost surely, 2^31243101100 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 31243101100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35450231040).

31243101100 is an abundant number, since it is smaller than the sum of its proper divisors (39657360980).

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

31243101100 is a wasteful number, since it uses less digits than its factorization.

31243101100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29839 (or 29832 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31243101100 its reverse (110134213), we get a palindrome (31353235313).

The spelling of 31243101100 in words is "thirty-one billion, two hundred forty-three million, one hundred one thousand, one hundred".