131123013121 has 4 divisors (see below), whose sum is σ = 133912864512. Its totient is φ = 128333161732.

The previous prime is 131123013097. The next prime is 131123013139. The reversal of 131123013121 is 121310321131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121310321131 = 17 ⋅7135901243.

It is a cyclic number.

It is not a de Polignac number, because 131123013121 - 2²⁷ = 130988795393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131123013221) 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, 1394925625 + ... + 1394925718.

It is an arithmetic number, because the mean of its divisors is an integer number (33478216128).

Almost surely, 2^131123013121 is an apocalyptic number.

It is an amenable number.

131123013121 is a deficient number, since it is larger than the sum of its proper divisors (2789851391).

131123013121 is an equidigital number, since it uses as much as digits as its factorization.

131123013121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2789851390.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 131123013121 its reverse (121310321131), we get a palindrome (252433334252).

The spelling of 131123013121 in words is "one hundred thirty-one billion, one hundred twenty-three million, thirteen thousand, one hundred twenty-one".