131113121 has 4 divisors (see below), whose sum is σ = 134311044. Its totient is φ = 127915200.

The previous prime is 131113111. The next prime is 131113123. The reversal of 131113121 is 121311131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121311131 = 23 ⋅5274397.

It can be written as a sum of positive squares in 2 ways, for example, as 16516096 + 114597025 = 4064^2 + 10705^2 .

It is a cyclic number.

It is not a de Polignac number, because 131113121 - 2¹⁰ = 131112097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131113096 and 131113105.

It is not an unprimeable number, because it can be changed into a prime (131113123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1598900 + ... + 1598981.

It is an arithmetic number, because the mean of its divisors is an integer number (33577761).

Almost surely, 2^131113121 is an apocalyptic number.

It is an amenable number.

131113121 is a deficient number, since it is larger than the sum of its proper divisors (3197923).

131113121 is an equidigital number, since it uses as much as digits as its factorization.

131113121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3197922.

The product of its digits is 18, while the sum is 14.

The square root of 131113121 is about 11450.4637897336. The cubic root of 131113121 is about 508.0214524286.

Adding to 131113121 its reverse (121311131), we get a palindrome (252424252).

The spelling of 131113121 in words is "one hundred thirty-one million, one hundred thirteen thousand, one hundred twenty-one".