131213156218 has 24 divisors (see below), whose sum is σ = 209131481052. Its totient is φ = 61731692544.

The previous prime is 131213156171. The next prime is 131213156219. The reversal of 131213156218 is 812651312131.

131213156218 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 116296686529 + 14916469689 = 341023^2 + 122133^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (131213156219) 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, 2431546 + ... + 2484922.

Almost surely, 2^131213156218 is an apocalyptic number.

131213156218 is a deficient number, since it is larger than the sum of its proper divisors (77918324834).

131213156218 is a wasteful number, since it uses less digits than its factorization.

131213156218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57666 (or 57649 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

Adding to 131213156218 its reverse (812651312131), we get a palindrome (943864468349).

The spelling of 131213156218 in words is "one hundred thirty-one billion, two hundred thirteen million, one hundred fifty-six thousand, two hundred eighteen".