9791561693 has 2 divisors, whose sum is σ = 9791561694. Its totient is φ = 9791561692.

The previous prime is 9791561687. The next prime is 9791561713. The reversal of 9791561693 is 3961651979.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9674099449 + 117462244 = 98357^2 + 10838^2 .

It is a cyclic number.

It is not a de Polignac number, because 9791561693 - 2⁴ = 9791561677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9791567693) 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, 4895780846 + 4895780847.

It is an arithmetic number, because the mean of its divisors is an integer number (4895780847).

Almost surely, 2^9791561693 is an apocalyptic number.

It is an amenable number.

9791561693 is a deficient number, since it is larger than the sum of its proper divisors (1).

9791561693 is an equidigital number, since it uses as much as digits as its factorization.

9791561693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2755620, while the sum is 56.

The square root of 9791561693 is about 98952.3203012441. The cubic root of 9791561693 is about 2139.3605750395.

The spelling of 9791561693 in words is "nine billion, seven hundred ninety-one million, five hundred sixty-one thousand, six hundred ninety-three".