8521207 has 4 divisors (see below), whose sum is σ = 8641296. Its totient is φ = 8401120.

The previous prime is 8521189. The next prime is 8521213. The reversal of 8521207 is 7021258.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7021258 = 2 ⋅3510629.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8521207 is a prime.

It is a super-2 number, since 2×8521207² = 145221937473698, which contains 22 as substring.

It is a Duffinian number.

8521207 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8521237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59938 + ... + 60079.

It is an arithmetic number, because the mean of its divisors is an integer number (2160324).

Almost surely, 2^8521207 is an apocalyptic number.

8521207 is a deficient number, since it is larger than the sum of its proper divisors (120089).

8521207 is a wasteful number, since it uses less digits than its factorization.

8521207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120088.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 8521207 is about 2919.1106522364. The cubic root of 8521207 is about 204.2523389631.

The spelling of 8521207 in words is "eight million, five hundred twenty-one thousand, two hundred seven".