9556728169 has 2 divisors, whose sum is σ = 9556728170. Its totient is φ = 9556728168.

The previous prime is 9556728163. The next prime is 9556728191. The reversal of 9556728169 is 9618276559.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4934360025 + 4622368144 = 70245^2 + 67988^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9556728169 is a prime.

It is a super-2 number, since 2×9556728169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9556728163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4778364084 + 4778364085.

It is an arithmetic number, because the mean of its divisors is an integer number (4778364085).

Almost surely, 2^9556728169 is an apocalyptic number.

It is an amenable number.

9556728169 is a deficient number, since it is larger than the sum of its proper divisors (1).

9556728169 is an equidigital number, since it uses as much as digits as its factorization.

9556728169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 58.

The square root of 9556728169 is about 97758.5196747578. The cubic root of 9556728169 is about 2122.1190519062.

The spelling of 9556728169 in words is "nine billion, five hundred fifty-six million, seven hundred twenty-eight thousand, one hundred sixty-nine".