8561537 has 2 divisors, whose sum is σ = 8561538. Its totient is φ = 8561536.

The previous prime is 8561503. The next prime is 8561551. The reversal of 8561537 is 7351658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8473921 + 87616 = 2911^2 + 296^2 .

It is a cyclic number.

It is not a de Polignac number, because 8561537 - 2⁸ = 8561281 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 8561497 and 8561506.

It is not a weakly prime, because it can be changed into another prime (8561237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4280768 + 4280769.

It is an arithmetic number, because the mean of its divisors is an integer number (4280769).

Almost surely, 2^8561537 is an apocalyptic number.

It is an amenable number.

8561537 is a deficient number, since it is larger than the sum of its proper divisors (1).

8561537 is an equidigital number, since it uses as much as digits as its factorization.

8561537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 35.

The square root of 8561537 is about 2926.0104237682. The cubic root of 8561537 is about 204.5740670606.

The spelling of 8561537 in words is "eight million, five hundred sixty-one thousand, five hundred thirty-seven".