131115203411251 has 4 divisors (see below), whose sum is σ = 131581805558904. Its totient is φ = 130648601263600.

The previous prime is 131115203411239. The next prime is 131115203411293. The reversal of 131115203411251 is 152114302511131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131115203411251 - 2¹³ = 131115203403059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131115203411201) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 233301073405 + ... + 233301073966.

It is an arithmetic number, because the mean of its divisors is an integer number (32895451389726).

Almost surely, 2^{131115203411251} is an apocalyptic number.

131115203411251 is a deficient number, since it is larger than the sum of its proper divisors (466602147653).

131115203411251 is an equidigital number, since it uses as much as digits as its factorization.

131115203411251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466602147652.

The product of its (nonzero) digits is 3600, while the sum is 31.

Adding to 131115203411251 its reverse (152114302511131), we get a palindrome (283229505922382).

The spelling of 131115203411251 in words is "one hundred thirty-one trillion, one hundred fifteen billion, two hundred three million, four hundred eleven thousand, two hundred fifty-one".