561310817 has 2 divisors, whose sum is σ = 561310818. Its totient is φ = 561310816.

The previous prime is 561310781. The next prime is 561310819. The reversal of 561310817 is 718013165.

Together with previous prime (561310781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 425844496 + 135466321 = 20636^2 + 11639^2 .

It is a cyclic number.

It is not a de Polignac number, because 561310817 - 2⁶ = 561310753 is a prime.

Together with 561310819, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_29407181 and since 561310817 and 29407181 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (561310819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280655408 + 280655409.

It is an arithmetic number, because the mean of its divisors is an integer number (280655409).

Almost surely, 2^561310817 is an apocalyptic number.

It is an amenable number.

561310817 is a deficient number, since it is larger than the sum of its proper divisors (1).

561310817 is an equidigital number, since it uses as much as digits as its factorization.

561310817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 561310817 is about 23691.9990081040. Note that the first 3 decimals coincide. The cubic root of 561310817 is about 824.8996839152.

The spelling of 561310817 in words is "five hundred sixty-one million, three hundred ten thousand, eight hundred seventeen".