1321679 has 2 divisors, whose sum is σ = 1321680. Its totient is φ = 1321678.

The previous prime is 1321669. The next prime is 1321681. The reversal of 1321679 is 9761231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321679 - 2¹² = 1317583 is a prime.

Together with 1321681, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321669) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660839 + 660840.

It is an arithmetic number, because the mean of its divisors is an integer number (660840).

2^1321679 is an apocalyptic number.

1321679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321679 is an equidigital number, since it uses as much as digits as its factorization.

1321679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 29.

The square root of 1321679 is about 1149.6429880619. The cubic root of 1321679 is about 109.7426213943.

The spelling of 1321679 in words is "one million, three hundred twenty-one thousand, six hundred seventy-nine".