13171321 has 2 divisors, whose sum is σ = 13171322. Its totient is φ = 13171320.

The previous prime is 13171289. The next prime is 13171343. The reversal of 13171321 is 12317131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12702096 + 469225 = 3564^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 13171321 - 2⁵ = 13171289 is a prime.

It is not a weakly prime, because it can be changed into another prime (13171391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6585660 + 6585661.

It is an arithmetic number, because the mean of its divisors is an integer number (6585661).

Almost surely, 2^13171321 is an apocalyptic number.

It is an amenable number.

13171321 is a deficient number, since it is larger than the sum of its proper divisors (1).

13171321 is an equidigital number, since it uses as much as digits as its factorization.

13171321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126, while the sum is 19.

The square root of 13171321 is about 3629.2314613427. The cubic root of 13171321 is about 236.1618694636.

Adding to 13171321 its reverse (12317131), we get a palindrome (25488452).

The spelling of 13171321 in words is "thirteen million, one hundred seventy-one thousand, three hundred twenty-one".