31130200 has 48 divisors (see below), whose sum is σ = 74727360. Its totient is φ = 12048000.

The previous prime is 31130171. The next prime is 31130221. The reversal of 31130200 is 203113.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3690 + ... + 8710.

It is an arithmetic number, because the mean of its divisors is an integer number (1556820).

Almost surely, 2^31130200 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 31130200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37363680).

31130200 is an abundant number, since it is smaller than the sum of its proper divisors (43597160).

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

31130200 is a wasteful number, since it uses less digits than its factorization.

31130200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5068 (or 5059 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 31130200 is about 5579.4444167856. Note that the first 4 decimals coincide. The cubic root of 31130200 is about 314.5772442525.

Adding to 31130200 its reverse (203113), we get a palindrome (31333313).

The spelling of 31130200 in words is "thirty-one million, one hundred thirty thousand, two hundred".