131021231224431 has 4 divisors (see below), whose sum is σ = 174694974965912. Its totient is φ = 87347487482952.

The previous prime is 131021231224363. The next prime is 131021231224463. The reversal of 131021231224431 is 134422132120131.

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

It is not a de Polignac number, because 131021231224431 - 2¹⁷ = 131021231093359 is a prime.

It is a super-2 number, since 2×131021231224431² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131021231224931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21836871870736 + ... + 21836871870741.

It is an arithmetic number, because the mean of its divisors is an integer number (43673743741478).

Almost surely, 2^{131021231224431} is an apocalyptic number.

131021231224431 is a deficient number, since it is larger than the sum of its proper divisors (43673743741481).

131021231224431 is an equidigital number, since it uses as much as digits as its factorization.

131021231224431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43673743741480.

The product of its (nonzero) digits is 6912, while the sum is 30.

Adding to 131021231224431 its reverse (134422132120131), we get a palindrome (265443363344562).

The spelling of 131021231224431 in words is "one hundred thirty-one trillion, twenty-one billion, two hundred thirty-one million, two hundred twenty-four thousand, four hundred thirty-one".