13645217 has 2 divisors, whose sum is σ = 13645218. Its totient is φ = 13645216.

The previous prime is 13645207. The next prime is 13645223. The reversal of 13645217 is 71254631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9740641 + 3904576 = 3121^2 + 1976^2 .

It is a cyclic number.

It is not a de Polignac number, because 13645217 - 2¹⁰ = 13644193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13645217.

It is not a weakly prime, because it can be changed into another prime (13645207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6822608 + 6822609.

It is an arithmetic number, because the mean of its divisors is an integer number (6822609).

Almost surely, 2^13645217 is an apocalyptic number.

It is an amenable number.

13645217 is a deficient number, since it is larger than the sum of its proper divisors (1).

13645217 is an equidigital number, since it uses as much as digits as its factorization.

13645217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 29.

The square root of 13645217 is about 3693.9432859750. The cubic root of 13645217 is about 238.9608836387.

Adding to 13645217 its reverse (71254631), we get a palindrome (84899848).

The spelling of 13645217 in words is "thirteen million, six hundred forty-five thousand, two hundred seventeen".