8561477 has 2 divisors, whose sum is σ = 8561478. Its totient is φ = 8561476.

The previous prime is 8561471. The next prime is 8561479. The reversal of 8561477 is 7741658.

It is a Cunningham number, because it is equal to 2926²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8561476 + 1 = 2926^2 + 1^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8561477 is a prime.

Together with 8561479, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8561477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8561471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4280738 + 4280739.

It is an arithmetic number, because the mean of its divisors is an integer number (4280739).

Almost surely, 2^8561477 is an apocalyptic number.

It is an amenable number.

8561477 is a deficient number, since it is larger than the sum of its proper divisors (1).

8561477 is an equidigital number, since it uses as much as digits as its factorization.

8561477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 38.

The square root of 8561477 is about 2926.0001708817. Note that the first 3 decimals coincide. The cubic root of 8561477 is about 204.5735891685.

The spelling of 8561477 in words is "eight million, five hundred sixty-one thousand, four hundred seventy-seven".