130731818 has 24 divisors (see below), whose sum is σ = 236536992. Its totient is φ = 53077032.

The previous prime is 130731817. The next prime is 130731857. The reversal of 130731818 is 818137031.

It is not an unprimeable number, because it can be changed into a prime (130731817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7880 + ... + 17987.

It is an arithmetic number, because the mean of its divisors is an integer number (9855708).

Almost surely, 2^130731818 is an apocalyptic number.

130731818 is a deficient number, since it is larger than the sum of its proper divisors (105805174).

130731818 is a wasteful number, since it uses less digits than its factorization.

130731818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25914 (or 25895 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 130731818 is about 11433.8015550385. The cubic root of 130731818 is about 507.5284984846.

Adding to 130731818 its reverse (818137031), we get a palindrome (948868849).

The spelling of 130731818 in words is "one hundred thirty million, seven hundred thirty-one thousand, eight hundred eighteen".