8641247 has 2 divisors, whose sum is σ = 8641248. Its totient is φ = 8641246.

The previous prime is 8641231. The next prime is 8641249. The reversal of 8641247 is 7421468.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8641247 - 2⁴ = 8641231 is a prime.

It is a super-2 number, since 2×8641247² = 149342299430018, which contains 22 as substring.

Together with 8641249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8641249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4320623 + 4320624.

It is an arithmetic number, because the mean of its divisors is an integer number (4320624).

Almost surely, 2^8641247 is an apocalyptic number.

8641247 is a deficient number, since it is larger than the sum of its proper divisors (1).

8641247 is an equidigital number, since it uses as much as digits as its factorization.

8641247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 32.

The square root of 8641247 is about 2939.5998026942. The cubic root of 8641247 is about 205.2069850708.

It can be divided in two parts, 8641 and 247, that added together give a palindrome (8888).

The spelling of 8641247 in words is "eight million, six hundred forty-one thousand, two hundred forty-seven".