1681279 has 2 divisors, whose sum is σ = 1681280. Its totient is φ = 1681278.

The previous prime is 1681271. The next prime is 1681289. The reversal of 1681279 is 9721861.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1681279 - 2³ = 1681271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840639 + 840640.

It is an arithmetic number, because the mean of its divisors is an integer number (840640).

2^1681279 is an apocalyptic number.

1681279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681279 is an equidigital number, since it uses as much as digits as its factorization.

1681279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 34.

The square root of 1681279 is about 1296.6414307741. The cubic root of 1681279 is about 118.9085991654.

The spelling of 1681279 in words is "one million, six hundred eighty-one thousand, two hundred seventy-nine".