1681271 has 2 divisors, whose sum is σ = 1681272. Its totient is φ = 1681270.

The previous prime is 1681261. The next prime is 1681279. The reversal of 1681271 is 1721861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1681271 - 2¹⁰ = 1680247 is a prime.

It is a Chen prime.

It is equal to p₁₂₆₈₄₅ and since 1681271 and 126845 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1681271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840635 + 840636.

It is an arithmetic number, because the mean of its divisors is an integer number (840636).

2^1681271 is an apocalyptic number.

1681271 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681271 is an equidigital number, since it uses as much as digits as its factorization.

1681271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 26.

The square root of 1681271 is about 1296.6383458775. The cubic root of 1681271 is about 118.9084105649.

The spelling of 1681271 in words is "one million, six hundred eighty-one thousand, two hundred seventy-one".