1317691 has 2 divisors, whose sum is σ = 1317692. Its totient is φ = 1317690.

The previous prime is 1317683. The next prime is 1317697. The reversal of 1317691 is 1967131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1317691 - 2³ = 1317683 is a prime.

It is an Ulam number.

1317691 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1317697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658845 + 658846.

It is an arithmetic number, because the mean of its divisors is an integer number (658846).

2^1317691 is an apocalyptic number.

1317691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317691 is an equidigital number, since it uses as much as digits as its factorization.

1317691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134, while the sum is 28.

The square root of 1317691 is about 1147.9072262165. The cubic root of 1317691 is about 109.6321320088.

The spelling of 1317691 in words is "one million, three hundred seventeen thousand, six hundred ninety-one".