131331121232305 has 4 divisors (see below), whose sum is σ = 157597345478772. Its totient is φ = 105064896985840.

The previous prime is 131331121232257. The next prime is 131331121232321. The reversal of 131331121232305 is 503232121133131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33453360396544 + 97877760835761 = 5783888^2 + 9893319^2 .

It is a de Polignac number, because none of the positive numbers 2^k-131331121232305 is a prime.

It is a super-2 number, since 2×131331121232305² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13133112123226 + ... + 13133112123235.

It is an arithmetic number, because the mean of its divisors is an integer number (39399336369693).

Almost surely, 2^{131331121232305} is an apocalyptic number.

It is an amenable number.

131331121232305 is a deficient number, since it is larger than the sum of its proper divisors (26266224246467).

131331121232305 is an equidigital number, since it uses as much as digits as its factorization.

131331121232305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26266224246466.

The product of its (nonzero) digits is 9720, while the sum is 31.

Adding to 131331121232305 its reverse (503232121133131), we get a palindrome (634563242365436).

The spelling of 131331121232305 in words is "one hundred thirty-one trillion, three hundred thirty-one billion, one hundred twenty-one million, two hundred thirty-two thousand, three hundred five".