1365809449 has 2 divisors, whose sum is σ = 1365809450. Its totient is φ = 1365809448.

The previous prime is 1365809441. The next prime is 1365809479. The reversal of 1365809449 is 9449085631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 804119449 + 561690000 = 28357^2 + 23700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1365809449 - 2³ = 1365809441 is a prime.

It is not a weakly prime, because it can be changed into another prime (1365809441) 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, 682904724 + 682904725.

It is an arithmetic number, because the mean of its divisors is an integer number (682904725).

Almost surely, 2^1365809449 is an apocalyptic number.

It is an amenable number.

1365809449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1365809449 is an equidigital number, since it uses as much as digits as its factorization.

1365809449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 1365809449 is about 36956.8592956707. The cubic root of 1365809449 is about 1109.5069771641.

The spelling of 1365809449 in words is "one billion, three hundred sixty-five million, eight hundred nine thousand, four hundred forty-nine".