6405709949 has 2 divisors, whose sum is σ = 6405709950. Its totient is φ = 6405709948.

The previous prime is 6405709943. The next prime is 6405709963. The reversal of 6405709949 is 9499075046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5167021924 + 1238688025 = 71882^2 + 35195^2 .

It is a cyclic number.

It is not a de Polignac number, because 6405709949 - 2¹² = 6405705853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6405709949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6405709943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202854974 + 3202854975.

It is an arithmetic number, because the mean of its divisors is an integer number (3202854975).

Almost surely, 2^6405709949 is an apocalyptic number.

It is an amenable number.

6405709949 is a deficient number, since it is larger than the sum of its proper divisors (1).

6405709949 is an equidigital number, since it uses as much as digits as its factorization.

6405709949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 53.

The square root of 6405709949 is about 80035.6792249557. The cubic root of 6405709949 is about 1857.1875200606.

The spelling of 6405709949 in words is "six billion, four hundred five million, seven hundred nine thousand, nine hundred forty-nine".