18312931282 has 16 divisors (see below), whose sum is σ = 27777760920. Its totient is φ = 9053849088.

The previous prime is 18312931277. The next prime is 18312931283. The reversal of 18312931282 is 28213921381.

It can be written as a sum of positive squares in 4 ways, for example, as 12320778001 + 5992153281 = 110999^2 + 77409^2 .

It is not an unprimeable number, because it can be changed into a prime (18312931283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174444 + ... + 258952.

Almost surely, 2^18312931282 is an apocalyptic number.

18312931282 is a deficient number, since it is larger than the sum of its proper divisors (9464829638).

18312931282 is a wasteful number, since it uses less digits than its factorization.

18312931282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85725.

The product of its digits is 41472, while the sum is 40.

Subtracting 18312931282 from its reverse (28213921381), we obtain a palindrome (9900990099).

The spelling of 18312931282 in words is "eighteen billion, three hundred twelve million, nine hundred thirty-one thousand, two hundred eighty-two".