8524921 has 4 divisors (see below), whose sum is σ = 8574372. Its totient is φ = 8475472.

The previous prime is 8524909. The next prime is 8524931. The reversal of 8524921 is 1294258.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7096896 + 1428025 = 2664^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 8524921 - 2⁵ = 8524889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8524931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24466 + ... + 24811.

It is an arithmetic number, because the mean of its divisors is an integer number (2143593).

Almost surely, 2^8524921 is an apocalyptic number.

It is an amenable number.

8524921 is a deficient number, since it is larger than the sum of its proper divisors (49451).

8524921 is a wasteful number, since it uses less digits than its factorization.

8524921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49450.

The product of its digits is 5760, while the sum is 31.

The square root of 8524921 is about 2919.7467355920. The cubic root of 8524921 is about 204.2820093686.

The spelling of 8524921 in words is "eight million, five hundred twenty-four thousand, nine hundred twenty-one".