131231223113231 has 4 divisors (see below), whose sum is σ = 138950706825792. Its totient is φ = 123511739400672.

The previous prime is 131231223113183. The next prime is 131231223113233. The reversal of 131231223113231 is 132311322132131.

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 131231223113231 - 2¹⁰ = 131231223112207 is a prime.

It is a super-2 number, since 2×131231223113231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131231223113194 and 131231223113203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131231223113233) 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, 3859741856255 + ... + 3859741856288.

It is an arithmetic number, because the mean of its divisors is an integer number (34737676706448).

Almost surely, 2^{131231223113231} is an apocalyptic number.

131231223113231 is a deficient number, since it is larger than the sum of its proper divisors (7719483712561).

131231223113231 is an equidigital number, since it uses as much as digits as its factorization.

131231223113231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7719483712560.

The product of its digits is 3888, while the sum is 29.

Adding to 131231223113231 its reverse (132311322132131), we get a palindrome (263542545245362).

The spelling of 131231223113231 in words is "one hundred thirty-one trillion, two hundred thirty-one billion, two hundred twenty-three million, one hundred thirteen thousand, two hundred thirty-one".