1366748309 has 2 divisors, whose sum is σ = 1366748310. Its totient is φ = 1366748308.

The previous prime is 1366748239. The next prime is 1366748311. The reversal of 1366748309 is 9038476631.

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., 1326780625 + 39967684 = 36425^2 + 6322^2 .

It is an emirp because it is prime and its reverse (9038476631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1366748309 - 2¹⁶ = 1366682773 is a prime.

Together with 1366748311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1366748329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683374154 + 683374155.

It is an arithmetic number, because the mean of its divisors is an integer number (683374155).

Almost surely, 2^1366748309 is an apocalyptic number.

It is an amenable number.

1366748309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366748309 is an equidigital number, since it uses as much as digits as its factorization.

1366748309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 47.

The square root of 1366748309 is about 36969.5592210673. The cubic root of 1366748309 is about 1109.7611446665.

The spelling of 1366748309 in words is "one billion, three hundred sixty-six million, seven hundred forty-eight thousand, three hundred nine".