561954471917 has 2 divisors, whose sum is σ = 561954471918. Its totient is φ = 561954471916.

The previous prime is 561954471913. The next prime is 561954471959. The reversal of 561954471917 is 719174459165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 347190814441 + 214763657476 = 589229^2 + 463426^2 .

It is a cyclic number.

It is not a de Polignac number, because 561954471917 - 2² = 561954471913 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561954471913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280977235958 + 280977235959.

It is an arithmetic number, because the mean of its divisors is an integer number (280977235959).

Almost surely, 2^561954471917 is an apocalyptic number.

It is an amenable number.

561954471917 is a deficient number, since it is larger than the sum of its proper divisors (1).

561954471917 is an equidigital number, since it uses as much as digits as its factorization.

561954471917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9525600, while the sum is 59.

The spelling of 561954471917 in words is "five hundred sixty-one billion, nine hundred fifty-four million, four hundred seventy-one thousand, nine hundred seventeen".