8520961 has 4 divisors (see below), whose sum is σ = 9022212. Its totient is φ = 8019712.

The previous prime is 8520947. The next prime is 8520973. The reversal of 8520961 is 1690258.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1690258 = 2 ⋅845129.

It can be written as a sum of positive squares in 2 ways, for example, as 6682225 + 1838736 = 2585^2 + 1356^2 .

It is a cyclic number.

It is not a de Polignac number, because 8520961 - 2⁵ = 8520929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8520901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250600 + ... + 250633.

It is an arithmetic number, because the mean of its divisors is an integer number (2255553).

Almost surely, 2^8520961 is an apocalyptic number.

It is an amenable number.

8520961 is a deficient number, since it is larger than the sum of its proper divisors (501251).

8520961 is a wasteful number, since it uses less digits than its factorization.

8520961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501250.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 8520961 is about 2919.0685158112. The cubic root of 8520961 is about 204.2503734137.

The spelling of 8520961 in words is "eight million, five hundred twenty thousand, nine hundred sixty-one".