8971643 has 4 divisors (see below), whose sum is σ = 9281040. Its totient is φ = 8662248.

The previous prime is 8971639. The next prime is 8971657. The reversal of 8971643 is 3461798.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3461798 = 2 ⋅1730899.

It is a cyclic number.

It is not a de Polignac number, because 8971643 - 2² = 8971639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8971597 and 8971606.

It is not an unprimeable number, because it can be changed into a prime (8971663) 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 3 ways as a sum of consecutive naturals, for example, 154655 + ... + 154712.

It is an arithmetic number, because the mean of its divisors is an integer number (2320260).

Almost surely, 2^8971643 is an apocalyptic number.

8971643 is a deficient number, since it is larger than the sum of its proper divisors (309397).

8971643 is a wasteful number, since it uses less digits than its factorization.

8971643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309396.

The product of its digits is 36288, while the sum is 38.

The square root of 8971643 is about 2995.2701046817. The cubic root of 8971643 is about 207.7896897307.

The spelling of 8971643 in words is "eight million, nine hundred seventy-one thousand, six hundred forty-three".