113131321 has 2 divisors, whose sum is σ = 113131322. Its totient is φ = 113131320.

The previous prime is 113131297. The next prime is 113131331. The reversal of 113131321 is 123131311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112784400 + 346921 = 10620^2 + 589^2 .

It is a cyclic number.

It is not a de Polignac number, because 113131321 - 2⁵ = 113131289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 113131295 and 113131304.

It is not a weakly prime, because it can be changed into another prime (113131331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56565660 + 56565661.

It is an arithmetic number, because the mean of its divisors is an integer number (56565661).

Almost surely, 2^113131321 is an apocalyptic number.

It is an amenable number.

113131321 is a deficient number, since it is larger than the sum of its proper divisors (1).

113131321 is an equidigital number, since it uses as much as digits as its factorization.

113131321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54, while the sum is 16.

The square root of 113131321 is about 10636.3208394632. The cubic root of 113131321 is about 483.6460213149.

Adding to 113131321 its reverse (123131311), we get a palindrome (236262632).

The spelling of 113131321 in words is "one hundred thirteen million, one hundred thirty-one thousand, three hundred twenty-one".