930643561 has 2 divisors, whose sum is σ = 930643562. Its totient is φ = 930643560.

The previous prime is 930643531. The next prime is 930643577. The reversal of 930643561 is 165346039.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 878529600 + 52113961 = 29640^2 + 7219^2 .

It is an emirp because it is prime and its reverse (165346039) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 930643561 - 2⁷ = 930643433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 930643561.

It is not a weakly prime, because it can be changed into another prime (930643501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 465321780 + 465321781.

It is an arithmetic number, because the mean of its divisors is an integer number (465321781).

Almost surely, 2^930643561 is an apocalyptic number.

It is an amenable number.

930643561 is a deficient number, since it is larger than the sum of its proper divisors (1).

930643561 is an equidigital number, since it uses as much as digits as its factorization.

930643561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 930643561 is about 30506.4511374234. The cubic root of 930643561 is about 976.3251098378.

The spelling of 930643561 in words is "nine hundred thirty million, six hundred forty-three thousand, five hundred sixty-one".