13557217 has 2 divisors, whose sum is σ = 13557218. Its totient is φ = 13557216.

The previous prime is 13557191. The next prime is 13557251. The reversal of 13557217 is 71275531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7623121 + 5934096 = 2761^2 + 2436^2 .

It is a cyclic number.

It is not a de Polignac number, because 13557217 - 2¹⁵ = 13524449 is a prime.

It is not a weakly prime, because it can be changed into another prime (13557017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6778608 + 6778609.

It is an arithmetic number, because the mean of its divisors is an integer number (6778609).

Almost surely, 2^13557217 is an apocalyptic number.

It is an amenable number.

13557217 is a deficient number, since it is larger than the sum of its proper divisors (1).

13557217 is an equidigital number, since it uses as much as digits as its factorization.

13557217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7350, while the sum is 31.

The square root of 13557217 is about 3682.0126289843. The cubic root of 13557217 is about 238.4460774655.

The spelling of 13557217 in words is "thirteen million, five hundred fifty-seven thousand, two hundred seventeen".