131233011231 has 24 divisors (see below), whose sum is σ = 212394870144. Its totient is φ = 71729842800.

The previous prime is 131233011223. The next prime is 131233011251. The reversal of 131233011231 is 132110332131.

It is a happy number.

It is not a de Polignac number, because 131233011231 - 2³ = 131233011223 is a prime.

It is a super-2 number, since 2×131233011231² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 131233011198 and 131233011207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131233011251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19404045 + ... + 19410806.

It is an arithmetic number, because the mean of its divisors is an integer number (8849786256).

Almost surely, 2^131233011231 is an apocalyptic number.

131233011231 is a deficient number, since it is larger than the sum of its proper divisors (81161858913).

131233011231 is a wasteful number, since it uses less digits than its factorization.

131233011231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38814891 (or 38814884 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 131233011231 its reverse (132110332131), we get a palindrome (263343343362).

The spelling of 131233011231 in words is "one hundred thirty-one billion, two hundred thirty-three million, eleven thousand, two hundred thirty-one".