8529891921 has 16 divisors (see below), whose sum is σ = 12875310720. Its totient is φ = 5579299440.

The previous prime is 8529891919. The next prime is 8529891943. The reversal of 8529891921 is 1291989258.

8529891921 is a `hidden beast` number, since 8 + 529 + 8 + 91 + 9 + 21 = 666.

It is not a de Polignac number, because 8529891921 - 2¹ = 8529891919 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (8529891911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2978965 + ... + 2981826.

It is an arithmetic number, because the mean of its divisors is an integer number (804706920).

Almost surely, 2^8529891921 is an apocalyptic number.

It is an amenable number.

8529891921 is a deficient number, since it is larger than the sum of its proper divisors (4345418799).

8529891921 is a wasteful number, since it uses less digits than its factorization.

8529891921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5960853 (or 5960847 counting only the distinct ones).

The product of its digits is 933120, while the sum is 54.

The square root of 8529891921 is about 92357.4140012593. The cubic root of 8529891921 is about 2043.2170758277.

The spelling of 8529891921 in words is "eight billion, five hundred twenty-nine million, eight hundred ninety-one thousand, nine hundred twenty-one".