1366691317 has 4 divisors (see below), whose sum is σ = 1398474880. Its totient is φ = 1334907756.

The previous prime is 1366691279. The next prime is 1366691357. The reversal of 1366691317 is 7131966631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1366691317 - 2¹⁵ = 1366658549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 31783519 = 1366691317 / (1 + 3 + 6 + 6 + 6 + 9 + 1 + 3 + 1 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366691357) 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 in 3 ways as a sum of consecutive naturals, for example, 15891717 + ... + 15891802.

It is an arithmetic number, because the mean of its divisors is an integer number (349618720).

Almost surely, 2^1366691317 is an apocalyptic number.

It is an amenable number.

1366691317 is a deficient number, since it is larger than the sum of its proper divisors (31783563).

1366691317 is an equidigital number, since it uses as much as digits as its factorization.

1366691317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31783562.

The product of its digits is 122472, while the sum is 43.

The square root of 1366691317 is about 36968.7884167171. The cubic root of 1366691317 is about 1109.7457191523.

The spelling of 1366691317 in words is "one billion, three hundred sixty-six million, six hundred ninety-one thousand, three hundred seventeen".