1691317 has 4 divisors (see below), whose sum is σ = 1698156. Its totient is φ = 1684480.

The previous prime is 1691303. The next prime is 1691321. The reversal of 1691317 is 7131961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7131961 = 199 ⋅35839.

It can be written as a sum of positive squares in 2 ways, for example, as 1164241 + 527076 = 1079^2 + 726^2 .

It is a cyclic number.

It is not a de Polignac number, because 1691317 - 2⁷ = 1691189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691387) 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 in 3 ways as a sum of consecutive naturals, for example, 3034 + ... + 3547.

It is an arithmetic number, because the mean of its divisors is an integer number (424539).

2^1691317 is an apocalyptic number.

It is an amenable number.

1691317 is a deficient number, since it is larger than the sum of its proper divisors (6839).

1691317 is an equidigital number, since it uses as much as digits as its factorization.

1691317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6838.

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

The square root of 1691317 is about 1300.5064398149. The cubic root of 1691317 is about 119.1447758921.

The spelling of 1691317 in words is "one million, six hundred ninety-one thousand, three hundred seventeen".