131117121 has 12 divisors (see below), whose sum is σ = 192496980. Its totient is φ = 85978080.

The previous prime is 131117113. The next prime is 131117153. The reversal of 131117121 is 121711131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24800400 + 106316721 = 4980^2 + 10311^2 .

It is not a de Polignac number, because 131117121 - 2³ = 131117113 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 131117094 and 131117103.

It is not an unprimeable number, because it can be changed into a prime (131117521) 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 11 ways as a sum of consecutive naturals, for example, 118866 + ... + 119963.

It is an arithmetic number, because the mean of its divisors is an integer number (16041415).

Almost surely, 2^131117121 is an apocalyptic number.

It is an amenable number.

131117121 is a deficient number, since it is larger than the sum of its proper divisors (61379859).

131117121 is a wasteful number, since it uses less digits than its factorization.

131117121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238896 (or 238893 counting only the distinct ones).

The product of its digits is 42, while the sum is 18.

The square root of 131117121 is about 11450.6384538156. The cubic root of 131117121 is about 508.0266186168.

Adding to 131117121 its reverse (121711131), we get a palindrome (252828252).

The spelling of 131117121 in words is "one hundred thirty-one million, one hundred seventeen thousand, one hundred twenty-one".