131323231111 has 4 divisors (see below), whose sum is σ = 132623461224. Its totient is φ = 130023001000.

The previous prime is 131323231097. The next prime is 131323231121. The reversal of 131323231111 is 111132323131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111132323131 = 101 ⋅1100320031.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131323231111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131323231121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650114905 + ... + 650115106.

It is an arithmetic number, because the mean of its divisors is an integer number (33155865306).

Almost surely, 2^131323231111 is an apocalyptic number.

131323231111 is a deficient number, since it is larger than the sum of its proper divisors (1300230113).

131323231111 is a wasteful number, since it uses less digits than its factorization.

131323231111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300230112.

The product of its digits is 324, while the sum is 22.

Adding to 131323231111 its reverse (111132323131), we get a palindrome (242455554242).

The spelling of 131323231111 in words is "one hundred thirty-one billion, three hundred twenty-three million, two hundred thirty-one thousand, one hundred eleven".