31130140 has 24 divisors (see below), whose sum is σ = 65493792. Its totient is φ = 12429120.

The previous prime is 31130101. The next prime is 31130147. The reversal of 31130140 is 4103113.

It is a super-3 number, since 3×31130140³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31130140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31130147) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 13470 + ... + 15610.

It is an arithmetic number, because the mean of its divisors is an integer number (2728908).

Almost surely, 2^31130140 is an apocalyptic number.

It is an amenable number.

31130140 is an abundant number, since it is smaller than the sum of its proper divisors (34363652).

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

31130140 is a wasteful number, since it uses less digits than its factorization.

31130140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2877 (or 2875 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31130140 is about 5579.4390399036. The cubic root of 31130140 is about 314.5770421482.

Adding to 31130140 its reverse (4103113), we get a palindrome (35233253).

The spelling of 31130140 in words is "thirty-one million, one hundred thirty thousand, one hundred forty".