9611561 has 4 divisors (see below), whose sum is σ = 9618372. Its totient is φ = 9604752.

The previous prime is 9611551. The next prime is 9611573. The reversal of 9611561 is 1651169.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3083536 + 6528025 = 1756^2 + 2555^2 .

It is a cyclic number.

It is not a de Polignac number, because 9611561 - 2¹⁴ = 9595177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9611521) 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, 410 + ... + 4403.

It is an arithmetic number, because the mean of its divisors is an integer number (2404593).

Almost surely, 2^9611561 is an apocalyptic number.

It is an amenable number.

9611561 is a deficient number, since it is larger than the sum of its proper divisors (6811).

9611561 is a wasteful number, since it uses less digits than its factorization.

9611561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6810.

The product of its digits is 1620, while the sum is 29.

The square root of 9611561 is about 3100.2517639701. The cubic root of 9611561 is about 212.6169948599.

The spelling of 9611561 in words is "nine million, six hundred eleven thousand, five hundred sixty-one".