1681171 has 4 divisors (see below), whose sum is σ = 1720312. Its totient is φ = 1642032.

The previous prime is 1681157. The next prime is 1681187. The reversal of 1681171 is 1711861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1711861 = 149 ⋅11489.

It is a cyclic number.

It is not a de Polignac number, because 1681171 - 2⁹ = 1680659 is a prime.

It is a Duffinian number.

1681171 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1681151) 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 in 3 ways as a sum of consecutive naturals, for example, 19506 + ... + 19591.

It is an arithmetic number, because the mean of its divisors is an integer number (430078).

2^1681171 is an apocalyptic number.

1681171 is a deficient number, since it is larger than the sum of its proper divisors (39141).

1681171 is an equidigital number, since it uses as much as digits as its factorization.

1681171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39140.

The product of its digits is 336, while the sum is 25.

The square root of 1681171 is about 1296.5997840506. The cubic root of 1681171 is about 118.9060530079.

The spelling of 1681171 in words is "one million, six hundred eighty-one thousand, one hundred seventy-one".