31131130 has 32 divisors (see below), whose sum is σ = 58226688. Its totient is φ = 11971200.

The previous prime is 31131127. The next prime is 31131137. The reversal of 31131130 is 3113113.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31131130.

It is not an unprimeable number, because it can be changed into a prime (31131137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72015 + ... + 72445.

It is an arithmetic number, because the mean of its divisors is an integer number (1819584).

Almost surely, 2^31131130 is an apocalyptic number.

31131130 is a deficient number, since it is larger than the sum of its proper divisors (27095558).

31131130 is a wasteful number, since it uses less digits than its factorization.

31131130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702.

The product of its (nonzero) digits is 27, while the sum is 13.

The square root of 31131130 is about 5579.5277577946. The cubic root of 31131130 is about 314.5803768368.

Adding to 31131130 its reverse (3113113), we get a palindrome (34244243).

The spelling of 31131130 in words is "thirty-one million, one hundred thirty-one thousand, one hundred thirty".