131223321313218 has 12 divisors (see below), whose sum is σ = 284317196178678. Its totient is φ = 43741107104400.

The previous prime is 131223321313087. The next prime is 131223321313261. The reversal of 131223321313218 is 812313123322131.

It is a happy number.

131223321313218 is a `hidden beast` number, since 1 + 3 + 1 + 2 + 2 + 3 + 321 + 3 + 1 + 321 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 106246885757769 + 24976435555449 = 10307613^2 + 4997643^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3645092258683 + ... + 3645092258718.

Almost surely, 2^{131223321313218} is an apocalyptic number.

131223321313218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

131223321313218 is an abundant number, since it is smaller than the sum of its proper divisors (153093874865460).

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

131223321313218 is a wasteful number, since it uses less digits than its factorization.

131223321313218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7290184517409 (or 7290184517406 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

Adding to 131223321313218 its reverse (812313123322131), we get a palindrome (943536444635349).

The spelling of 131223321313218 in words is "one hundred thirty-one trillion, two hundred twenty-three billion, three hundred twenty-one million, three hundred thirteen thousand, two hundred eighteen".