9867561 has 8 divisors (see below), whose sum is σ = 14352864. Its totient is φ = 5980320.

The previous prime is 9867551. The next prime is 9867581. The reversal of 9867561 is 1657689.

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

It is not a de Polignac number, because 9867561 - 2¹⁰ = 9866537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9867521) 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, 149476 + ... + 149541.

It is an arithmetic number, because the mean of its divisors is an integer number (1794108).

Almost surely, 2^9867561 is an apocalyptic number.

It is an amenable number.

9867561 is a deficient number, since it is larger than the sum of its proper divisors (4485303).

9867561 is a wasteful number, since it uses less digits than its factorization.

9867561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299031.

The product of its digits is 90720, while the sum is 42.

The square root of 9867561 is about 3141.2674193707. The cubic root of 9867561 is about 214.4881351395.

The spelling of 9867561 in words is "nine million, eight hundred sixty-seven thousand, five hundred sixty-one".