8957561 has 2 divisors, whose sum is σ = 8957562. Its totient is φ = 8957560.

The previous prime is 8957551. The next prime is 8957563. The reversal of 8957561 is 1657598.

8957561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7529536 + 1428025 = 2744^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 8957561 - 2¹⁰ = 8956537 is a prime.

Together with 8957563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8957563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4478780 + 4478781.

It is an arithmetic number, because the mean of its divisors is an integer number (4478781).

Almost surely, 2^8957561 is an apocalyptic number.

It is an amenable number.

8957561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8957561 is an equidigital number, since it uses as much as digits as its factorization.

8957561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 41.

The square root of 8957561 is about 2992.9184753347. The cubic root of 8957561 is about 207.6809163919.

The spelling of 8957561 in words is "eight million, nine hundred fifty-seven thousand, five hundred sixty-one".