13209247 has 2 divisors, whose sum is σ = 13209248. Its totient is φ = 13209246.

The previous prime is 13209241. The next prime is 13209263. The reversal of 13209247 is 74290231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13209247 - 2¹¹ = 13207199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13209241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6604623 + 6604624.

It is an arithmetic number, because the mean of its divisors is an integer number (6604624).

Almost surely, 2^13209247 is an apocalyptic number.

13209247 is a deficient number, since it is larger than the sum of its proper divisors (1).

13209247 is an equidigital number, since it uses as much as digits as its factorization.

13209247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 13209247 is about 3634.4527786174. The cubic root of 13209247 is about 236.3883233897.

Adding to 13209247 its reverse (74290231), we get a palindrome (87499478).

It can be divided in two parts, 13209 and 247, that multiplied together give a palindrome (3262623).

The spelling of 13209247 in words is "thirteen million, two hundred nine thousand, two hundred forty-seven".