1316639 has 2 divisors, whose sum is σ = 1316640. Its totient is φ = 1316638.

The previous prime is 1316621. The next prime is 1316647. The reversal of 1316639 is 9366131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1316639 - 2¹² = 1312543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1316669) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658319 + 658320.

It is an arithmetic number, because the mean of its divisors is an integer number (658320).

2^1316639 is an apocalyptic number.

1316639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1316639 is an equidigital number, since it uses as much as digits as its factorization.

1316639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 29.

The square root of 1316639 is about 1147.4489095380. The cubic root of 1316639 is about 109.6029487103.

The spelling of 1316639 in words is "one million, three hundred sixteen thousand, six hundred thirty-nine".