8521601 has 4 divisors (see below), whose sum is σ = 9296304. Its totient is φ = 7746900.

The previous prime is 8521589. The next prime is 8521603. The reversal of 8521601 is 1061258.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8521601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8521603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387335 + ... + 387356.

It is an arithmetic number, because the mean of its divisors is an integer number (2324076).

Almost surely, 2^8521601 is an apocalyptic number.

It is an amenable number.

8521601 is a deficient number, since it is larger than the sum of its proper divisors (774703).

8521601 is a wasteful number, since it uses less digits than its factorization.

8521601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774702.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 8521601 is about 2919.1781377641. The cubic root of 8521601 is about 204.2554869593.

Adding to 8521601 its reverse (1061258), we get a palindrome (9582859).

The spelling of 8521601 in words is "eight million, five hundred twenty-one thousand, six hundred one".