31130380 has 12 divisors (see below), whose sum is σ = 65373840. Its totient is φ = 12452144.

The previous prime is 31130377. The next prime is 31130381. The reversal of 31130380 is 8303113.

It is not an unprimeable number, because it can be changed into a prime (31130381) 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 3 ways as a sum of consecutive naturals, for example, 778240 + ... + 778279.

It is an arithmetic number, because the mean of its divisors is an integer number (5447820).

Almost surely, 2^31130380 is an apocalyptic number.

It is an amenable number.

31130380 is an abundant number, since it is smaller than the sum of its proper divisors (34243460).

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

31130380 is a wasteful number, since it uses less digits than its factorization.

31130380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556528 (or 1556526 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 31130380 is about 5579.4605474006. The cubic root of 31130380 is about 314.5778505640.

Adding to 31130380 its reverse (8303113), we get a palindrome (39433493).

The spelling of 31130380 in words is "thirty-one million, one hundred thirty thousand, three hundred eighty".