9217561 has 2 divisors, whose sum is σ = 9217562. Its totient is φ = 9217560.

The previous prime is 9217541. The next prime is 9217567. The reversal of 9217561 is 1657129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5035536 + 4182025 = 2244^2 + 2045^2 .

It is an emirp because it is prime and its reverse (1657129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9217561 - 2⁹ = 9217049 is a prime.

It is not a weakly prime, because it can be changed into another prime (9217567) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4608780 + 4608781.

It is an arithmetic number, because the mean of its divisors is an integer number (4608781).

Almost surely, 2^9217561 is an apocalyptic number.

It is an amenable number.

9217561 is a deficient number, since it is larger than the sum of its proper divisors (1).

9217561 is an equidigital number, since it uses as much as digits as its factorization.

9217561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 31.

The square root of 9217561 is about 3036.0436426376. The cubic root of 9217561 is about 209.6711481871.

The spelling of 9217561 in words is "nine million, two hundred seventeen thousand, five hundred sixty-one".