8620561 has 4 divisors (see below), whose sum is σ = 8995392. Its totient is φ = 8245732.

The previous prime is 8620553. The next prime is 8620567. The reversal of 8620561 is 1650268.

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 not a de Polignac number, because 8620561 - 2³ = 8620553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8620567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187381 + ... + 187426.

It is an arithmetic number, because the mean of its divisors is an integer number (2248848).

Almost surely, 2^8620561 is an apocalyptic number.

It is an amenable number.

8620561 is a deficient number, since it is larger than the sum of its proper divisors (374831).

8620561 is a wasteful number, since it uses less digits than its factorization.

8620561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374830.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 8620561 is about 2936.0791883054. The cubic root of 8620561 is about 205.0431081266.

The spelling of 8620561 in words is "eight million, six hundred twenty thousand, five hundred sixty-one".