9561566 has 24 divisors (see below), whose sum is σ = 17079480. Its totient is φ = 4000752.

The previous prime is 9561557. The next prime is 9561611. The reversal of 9561566 is 6651659.

9561566 = 116² + 117² + ... + 311².

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3080 + ... + 5348.

It is an arithmetic number, because the mean of its divisors is an integer number (711645).

Almost surely, 2^9561566 is an apocalyptic number.

9561566 is a deficient number, since it is larger than the sum of its proper divisors (7517914).

9561566 is a wasteful number, since it uses less digits than its factorization.

9561566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328 (or 2321 counting only the distinct ones).

The product of its digits is 48600, while the sum is 38.

The square root of 9561566 is about 3092.1781966763. The cubic root of 9561566 is about 212.2477079649.

The spelling of 9561566 in words is "nine million, five hundred sixty-one thousand, five hundred sixty-six".