86643549 has 6 divisors (see below), whose sum is σ = 125151806. Its totient is φ = 57762360.

The previous prime is 86643539. The next prime is 86643551. The reversal of 86643549 is 94534668.

86643549 is a `hidden beast` number, since 8 + 66 + 43 + 549 = 666.

It can be written as a sum of positive squares in only one way, i.e., 85932900 + 710649 = 9270^2 + 843^2 .

It is not a de Polignac number, because 86643549 - 2⁵ = 86643517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86643539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4813522 + ... + 4813539.

Almost surely, 2^86643549 is an apocalyptic number.

It is an amenable number.

86643549 is a deficient number, since it is larger than the sum of its proper divisors (38508257).

86643549 is a wasteful number, since it uses less digits than its factorization.

86643549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9627067 (or 9627064 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 86643549 is about 9308.2516618321. The cubic root of 86643549 is about 442.4987800407.

The spelling of 86643549 in words is "eighty-six million, six hundred forty-three thousand, five hundred forty-nine".