8643149 has 2 divisors, whose sum is σ = 8643150. Its totient is φ = 8643148.

The previous prime is 8643143. The next prime is 8643181. The reversal of 8643149 is 9413468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8497225 + 145924 = 2915^2 + 382^2 .

It is a cyclic number.

It is not a de Polignac number, because 8643149 - 2⁴ = 8643133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8643143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4321574 + 4321575.

It is an arithmetic number, because the mean of its divisors is an integer number (4321575).

Almost surely, 2^8643149 is an apocalyptic number.

It is an amenable number.

8643149 is a deficient number, since it is larger than the sum of its proper divisors (1).

8643149 is an equidigital number, since it uses as much as digits as its factorization.

8643149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 8643149 is about 2939.9232983192. The cubic root of 8643149 is about 205.2220398059. Note that the first 3 decimals are identical.

The spelling of 8643149 in words is "eight million, six hundred forty-three thousand, one hundred forty-nine".