8767561 has 4 divisors (see below), whose sum is σ = 9564624. Its totient is φ = 7970500.

The previous prime is 8767559. The next prime is 8767567. The reversal of 8767561 is 1657678.

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 8767561 - 2¹ = 8767559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8767567) 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, 398515 + ... + 398536.

It is an arithmetic number, because the mean of its divisors is an integer number (2391156).

Almost surely, 2^8767561 is an apocalyptic number.

It is an amenable number.

8767561 is a deficient number, since it is larger than the sum of its proper divisors (797063).

8767561 is a wasteful number, since it uses less digits than its factorization.

8767561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797062.

The product of its digits is 70560, while the sum is 40.

The square root of 8767561 is about 2961.0067544671. The cubic root of 8767561 is about 206.2020279002.

Subtracting from 8767561 its sum of digits (40), we obtain a square (8767521 = 2961²).

The spelling of 8767561 in words is "eight million, seven hundred sixty-seven thousand, five hundred sixty-one".