1316509 has 2 divisors, whose sum is σ = 1316510. Its totient is φ = 1316508.

The previous prime is 1316507. The next prime is 1316519. The reversal of 1316509 is 9056131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1315609 + 900 = 1147^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 1316509 - 2¹ = 1316507 is a prime.

Together with 1316507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1316507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658254 + 658255.

It is an arithmetic number, because the mean of its divisors is an integer number (658255).

2^1316509 is an apocalyptic number.

It is an amenable number.

1316509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1316509 is an equidigital number, since it uses as much as digits as its factorization.

1316509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 1316509 is about 1147.3922607374. The cubic root of 1316509 is about 109.5993413302.

The spelling of 1316509 in words is "one million, three hundred sixteen thousand, five hundred nine".