131123110121 has 4 divisors (see below), whose sum is σ = 131147813700. Its totient is φ = 131098406544.

The previous prime is 131123110109. The next prime is 131123110123. The reversal of 131123110121 is 121011321131.

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 1180884496 + 129942225625 = 34364^2 + 360475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131123110121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131123110121.

It is not an unprimeable number, because it can be changed into a prime (131123110123) 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, 12343826 + ... + 12354443.

It is an arithmetic number, because the mean of its divisors is an integer number (32786953425).

Almost surely, 2^131123110121 is an apocalyptic number.

It is an amenable number.

131123110121 is a deficient number, since it is larger than the sum of its proper divisors (24703579).

131123110121 is an equidigital number, since it uses as much as digits as its factorization.

131123110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24703578.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 131123110121 its reverse (121011321131), we get a palindrome (252134431252).

The spelling of 131123110121 in words is "one hundred thirty-one billion, one hundred twenty-three million, one hundred ten thousand, one hundred twenty-one".