8939645069 has 2 divisors, whose sum is σ = 8939645070. Its totient is φ = 8939645068.

The previous prime is 8939645059. The next prime is 8939645081. The reversal of 8939645069 is 9605469398.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8560875625 + 378769444 = 92525^2 + 19462^2 .

It is a cyclic number.

It is not a de Polignac number, because 8939645069 - 2²⁴ = 8922867853 is a prime.

It is a super-2 number, since 2×8939645069² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 8939644999 and 8939645017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8939645059) 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, 4469822534 + 4469822535.

It is an arithmetic number, because the mean of its divisors is an integer number (4469822535).

Almost surely, 2^8939645069 is an apocalyptic number.

It is an amenable number.

8939645069 is a deficient number, since it is larger than the sum of its proper divisors (1).

8939645069 is an equidigital number, since it uses as much as digits as its factorization.

8939645069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12597120, while the sum is 59.

The square root of 8939645069 is about 94549.6962924789. The cubic root of 8939645069 is about 2075.4236378172.

The spelling of 8939645069 in words is "eight billion, nine hundred thirty-nine million, six hundred forty-five thousand, sixty-nine".