131231223113 has 4 divisors (see below), whose sum is σ = 131270132868. Its totient is φ = 131192313360.

The previous prime is 131231223061. The next prime is 131231223127. The reversal of 131231223113 is 311322132131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 112579038784 + 18652184329 = 335528^2 + 136573^2 .

It is a cyclic number.

It is not a de Polignac number, because 131231223113 - 2⁶ = 131231223049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131231223143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19449818 + ... + 19456563.

It is an arithmetic number, because the mean of its divisors is an integer number (32817533217).

Almost surely, 2^131231223113 is an apocalyptic number.

It is an amenable number.

131231223113 is a deficient number, since it is larger than the sum of its proper divisors (38909755).

131231223113 is an equidigital number, since it uses as much as digits as its factorization.

131231223113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38909754.

The product of its digits is 648, while the sum is 23.

Adding to 131231223113 its reverse (311322132131), we get a palindrome (442553355244).

The spelling of 131231223113 in words is "one hundred thirty-one billion, two hundred thirty-one million, two hundred twenty-three thousand, one hundred thirteen".