1391317 has 2 divisors, whose sum is σ = 1391318. Its totient is φ = 1391316.

The previous prime is 1391287. The next prime is 1391323. The reversal of 1391317 is 7131931.

1391317 is nontrivially palindromic in base 8.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1196836 + 194481 = 1094^2 + 441^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391317 - 2⁷ = 1391189 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1391291 and 1391300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695658 + 695659.

It is an arithmetic number, because the mean of its divisors is an integer number (695659).

2^1391317 is an apocalyptic number.

It is an amenable number.

1391317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391317 is an equidigital number, since it uses as much as digits as its factorization.

1391317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 567, while the sum is 25.

The square root of 1391317 is about 1179.5410124281. The cubic root of 1391317 is about 111.6371387980.

The spelling of 1391317 in words is "one million, three hundred ninety-one thousand, three hundred seventeen".