9787561 has 16 divisors (see below), whose sum is σ = 11652480. Its totient is φ = 8046720.

The previous prime is 9787553. The next prime is 9787567. The reversal of 9787561 is 1657879.

It is a cyclic number.

It is not a de Polignac number, because 9787561 - 2³ = 9787553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9787567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18975 + ... + 19483.

It is an arithmetic number, because the mean of its divisors is an integer number (728280).

Almost surely, 2^9787561 is an apocalyptic number.

It is an amenable number.

9787561 is a deficient number, since it is larger than the sum of its proper divisors (1864919).

9787561 is a wasteful number, since it uses less digits than its factorization.

9787561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624.

The product of its digits is 105840, while the sum is 43.

The square root of 9787561 is about 3128.5077912641. The cubic root of 9787561 is about 213.9069164568.

The spelling of 9787561 in words is "nine million, seven hundred eighty-seven thousand, five hundred sixty-one".