1317989 has 2 divisors, whose sum is σ = 1317990. Its totient is φ = 1317988.

The previous prime is 1317971. The next prime is 1318003. The reversal of 1317989 is 9897131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 693889 + 624100 = 833^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 1317989 - 2²⁰ = 269413 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1317929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658994 + 658995.

It is an arithmetic number, because the mean of its divisors is an integer number (658995).

2^1317989 is an apocalyptic number.

It is an amenable number.

1317989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317989 is an equidigital number, since it uses as much as digits as its factorization.

1317989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 38.

The square root of 1317989 is about 1148.0370203090. The cubic root of 1317989 is about 109.6403959373.

The spelling of 1317989 in words is "one million, three hundred seventeen thousand, nine hundred eighty-nine".