31100112 has 120 divisors (see below), whose sum is σ = 95236960. Its totient is φ = 9797760.

The previous prime is 31100101. The next prime is 31100149. The reversal of 31100112 is 21100113.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 31100094 and 31100103.

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, 73662 + ... + 74082.

Almost surely, 2^31100112 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 31100112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47618480).

31100112 is an abundant number, since it is smaller than the sum of its proper divisors (64136848).

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

31100112 is a wasteful number, since it uses less digits than its factorization.

31100112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 31100112 is about 5576.7474391441. The cubic root of 31100112 is about 314.4758630521.

Adding to 31100112 its reverse (21100113), we get a palindrome (52200225).

Subtracting from 31100112 its reverse (21100113), we obtain a palindrome (9999999).

The spelling of 31100112 in words is "thirty-one million, one hundred thousand, one hundred twelve".