131123023231 has 6 divisors (see below), whose sum is σ = 138387457032. Its totient is φ = 124221811140.

The previous prime is 131123023223. The next prime is 131123023237. The reversal of 131123023231 is 132320321131.

It is not a de Polignac number, because 131123023231 - 2³ = 131123023223 is a prime.

It is a super-2 number, since 2×131123023231² (a number of 23 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 (131123023237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 181610475 + ... + 181611196.

It is an arithmetic number, because the mean of its divisors is an integer number (23064576172).

Almost surely, 2^131123023231 is an apocalyptic number.

131123023231 is a deficient number, since it is larger than the sum of its proper divisors (7264433801).

131123023231 is an equidigital number, since it uses as much as digits as its factorization.

131123023231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363221709 (or 363221690 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 131123023231 its reverse (132320321131), we get a palindrome (263443344362).

The spelling of 131123023231 in words is "one hundred thirty-one billion, one hundred twenty-three million, twenty-three thousand, two hundred thirty-one".