917358949561 has 2 divisors, whose sum is σ = 917358949562. Its totient is φ = 917358949560.

The previous prime is 917358949523. The next prime is 917358949651. The reversal of 917358949561 is 165949853719.

It is a happy number.

Together with next prime (917358949651) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 848646288400 + 68712661161 = 921220^2 + 262131^2 .

It is a cyclic number.

It is not a de Polignac number, because 917358949561 - 2¹⁹ = 917358425273 is a prime.

It is a super-2 number, since 2×917358949561² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (917358941561) 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, 458679474780 + 458679474781.

It is an arithmetic number, because the mean of its divisors is an integer number (458679474781).

Almost surely, 2^917358949561 is an apocalyptic number.

It is an amenable number.

917358949561 is a deficient number, since it is larger than the sum of its proper divisors (1).

917358949561 is an equidigital number, since it uses as much as digits as its factorization.

917358949561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73483200, while the sum is 67.

The spelling of 917358949561 in words is "nine hundred seventeen billion, three hundred fifty-eight million, nine hundred forty-nine thousand, five hundred sixty-one".