8521243 has 2 divisors, whose sum is σ = 8521244. Its totient is φ = 8521242.

The previous prime is 8521237. The next prime is 8521259. The reversal of 8521243 is 3421258.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8521243 - 2²¹ = 6424091 is a prime.

It is a super-2 number, since 2×8521243² = 145223164530098, which contains 22 as substring.

It is equal to p₅₇₂₄₇₀ and since 8521243 and 572470 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (8521213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260621 + 4260622.

It is an arithmetic number, because the mean of its divisors is an integer number (4260622).

Almost surely, 2^8521243 is an apocalyptic number.

8521243 is a deficient number, since it is larger than the sum of its proper divisors (1).

8521243 is an equidigital number, since it uses as much as digits as its factorization.

8521243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 25.

The square root of 8521243 is about 2919.1168184915. The cubic root of 8521243 is about 204.2526266013.

The spelling of 8521243 in words is "eight million, five hundred twenty-one thousand, two hundred forty-three".