8641729069 has 2 divisors, whose sum is σ = 8641729070. Its totient is φ = 8641729068.

The previous prime is 8641729021. The next prime is 8641729079. The reversal of 8641729069 is 9609271468.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7680419044 + 961310025 = 87638^2 + 31005^2 .

It is a cyclic number.

It is not a de Polignac number, because 8641729069 - 2²³ = 8633340461 is a prime.

It is a super-2 number, since 2×8641729069² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8641729009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4320864534 + 4320864535.

It is an arithmetic number, because the mean of its divisors is an integer number (4320864535).

Almost surely, 2^8641729069 is an apocalyptic number.

It is an amenable number.

8641729069 is a deficient number, since it is larger than the sum of its proper divisors (1).

8641729069 is an equidigital number, since it uses as much as digits as its factorization.

8641729069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 8641729069 is about 92960.9007540267. The cubic root of 8641729069 is about 2052.1080095856.

The spelling of 8641729069 in words is "eight billion, six hundred forty-one million, seven hundred twenty-nine thousand, sixty-nine".