131201204121243 has 54 divisors (see below), whose sum is σ = 200478241597452. Its totient is φ = 82671278423760.

The previous prime is 131201204121227. The next prime is 131201204121307. The reversal of 131201204121243 is 342121402102131.

131201204121243 is a `hidden beast` number, since 1 + 3 + 1 + 2 + 0 + 1 + 2 + 0 + 412 + 1 + 243 = 666.

It is not a de Polignac number, because 131201204121243 - 2⁴ = 131201204121227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131201204121223) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 603428796 + ... + 603646182.

Almost surely, 2^{131201204121243} is an apocalyptic number.

131201204121243 is a deficient number, since it is larger than the sum of its proper divisors (69277037476209).

131201204121243 is an equidigital number, since it uses as much as digits as its factorization.

131201204121243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218293 (or 217840 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

Adding to 131201204121243 its reverse (342121402102131), we get a palindrome (473322606223374).

It can be divided in two parts, 1312012041 and 21243, that added together give a square (1312033284 = 36222²).

The spelling of 131201204121243 in words is "one hundred thirty-one trillion, two hundred one billion, two hundred four million, one hundred twenty-one thousand, two hundred forty-three".