31103131100 has 72 divisors (see below), whose sum is σ = 71178360960. Its totient is φ = 11764509120.

The previous prime is 31103131051. The next prime is 31103131121. The reversal of 31103131100 is 113130113.

It is a happy number.

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, 1024337 + ... + 1054263.

Almost surely, 2^31103131100 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 31103131100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35589180480).

31103131100 is an abundant number, since it is smaller than the sum of its proper divisors (40075229860).

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

31103131100 is a wasteful number, since it uses less digits than its factorization.

31103131100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30507 (or 30500 counting only the distinct ones).

The product of its (nonzero) digits is 27, while the sum is 14.

Adding to 31103131100 its reverse (113130113), we get a palindrome (31216261213).

The spelling of 31103131100 in words is "thirty-one billion, one hundred three million, one hundred thirty-one thousand, one hundred".