8543634921 has 16 divisors (see below), whose sum is σ = 12660379200. Its totient is φ = 5694342624.

The previous prime is 8543634919. The next prime is 8543634941. The reversal of 8543634921 is 1294363458.

8543634921 is a `hidden beast` number, since 8 + 5 + 4 + 3 + 634 + 9 + 2 + 1 = 666.

It is not a de Polignac number, because 8543634921 - 2¹ = 8543634919 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (8543634941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77845 + ... + 152141.

It is an arithmetic number, because the mean of its divisors is an integer number (791273700).

Almost surely, 2^8543634921 is an apocalyptic number.

It is an amenable number.

8543634921 is a deficient number, since it is larger than the sum of its proper divisors (4116744279).

8543634921 is a wasteful number, since it uses less digits than its factorization.

8543634921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78565 (or 78559 counting only the distinct ones).

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

The square root of 8543634921 is about 92431.7852310557. The cubic root of 8543634921 is about 2044.3138019300.

The spelling of 8543634921 in words is "eight billion, five hundred forty-three million, six hundred thirty-four thousand, nine hundred twenty-one".