9718561 has 4 divisors (see below), whose sum is σ = 9725872. Its totient is φ = 9711252.

The previous prime is 9718547. The next prime is 9718571. The reversal of 9718561 is 1658179.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1658179 = 107 ⋅15497.

It is a cyclic number.

It is not a de Polignac number, because 9718561 - 2⁵ = 9718529 is a prime.

It is a super-3 number, since 3×9718561³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9718561.

It is not an unprimeable number, because it can be changed into a prime (9718571) 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, 1035 + ... + 4528.

It is an arithmetic number, because the mean of its divisors is an integer number (2431468).

Almost surely, 2^9718561 is an apocalyptic number.

It is an amenable number.

9718561 is a deficient number, since it is larger than the sum of its proper divisors (7311).

9718561 is a wasteful number, since it uses less digits than its factorization.

9718561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7310.

The product of its digits is 15120, while the sum is 37.

The square root of 9718561 is about 3117.4606653493. The cubic root of 9718561 is about 213.4030661252.

The spelling of 9718561 in words is "nine million, seven hundred eighteen thousand, five hundred sixty-one".