8668549 has 2 divisors, whose sum is σ = 8668550. Its totient is φ = 8668548.

The previous prime is 8668547. The next prime is 8668553. The reversal of 8668549 is 9458668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8236900 + 431649 = 2870^2 + 657^2 .

It is a cyclic number.

It is not a de Polignac number, because 8668549 - 2¹ = 8668547 is a prime.

Together with 8668547, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 8668499 and 8668508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8668547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4334274 + 4334275.

It is an arithmetic number, because the mean of its divisors is an integer number (4334275).

Almost surely, 2^8668549 is an apocalyptic number.

It is an amenable number.

8668549 is a deficient number, since it is larger than the sum of its proper divisors (1).

8668549 is an equidigital number, since it uses as much as digits as its factorization.

8668549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 46.

The square root of 8668549 is about 2944.2399698394. The cubic root of 8668549 is about 205.4228748613.

It can be divided in two parts, 86 and 68549, that added together give a triangular number (68635 = T₃₇₀).

The spelling of 8668549 in words is "eight million, six hundred sixty-eight thousand, five hundred forty-nine".