8521651 has 8 divisors (see below), whose sum is σ = 8683200. Its totient is φ = 8361600.

The previous prime is 8521649. The next prime is 8521687. The reversal of 8521651 is 1561258.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8521651 - 2¹ = 8521649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8521631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21051 + ... + 21451.

It is an arithmetic number, because the mean of its divisors is an integer number (1085400).

Almost surely, 2^8521651 is an apocalyptic number.

8521651 is the 1306-th centered decagonal number.

8521651 is a deficient number, since it is larger than the sum of its proper divisors (161549).

8521651 is a wasteful number, since it uses less digits than its factorization.

8521651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749.

The product of its digits is 2400, while the sum is 28.

The square root of 8521651 is about 2919.1867018058. The cubic root of 8521651 is about 204.2558864442.

It can be divided in two parts, 85 and 21651, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 8521651 in words is "eight million, five hundred twenty-one thousand, six hundred fifty-one".