131321 has 2 divisors, whose sum is σ = 131322. Its totient is φ = 131320.
The previous prime is 131317. The next prime is 131357. The reversal of 131321 is 123131.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 75625 + 55696 = 275^2 + 236^2 .
It is a cyclic number.
It is not a de Polignac number, because 131321 - 22 = 131317 is a prime.
It is a Sophie Germain prime.
It is a Chen prime.
It is a d-powerful number, because it can be written as 1 + 3 + 35 + 1 + 217 + 1 .
It is a Curzon number.
It is not a weakly prime, because it can be changed into another prime (131311) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65660 + 65661.
It is an arithmetic number, because the mean of its divisors is an integer number (65661).
2131321 is an apocalyptic number.
It is an amenable number.
131321 is a deficient number, since it is larger than the sum of its proper divisors (1).
131321 is an equidigital number, since it uses as much as digits as its factorization.
131321 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 18, while the sum is 11.
The square root of 131321 is about 362.3823947159. The cubic root of 131321 is about 50.8289798894.
Adding to 131321 its reverse (123131), we get a palindrome (254452).
The spelling of 131321 in words is "one hundred thirty-one thousand, three hundred twenty-one".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.066 sec. • engine limits •