1681671 has 16 divisors (see below), whose sum is σ = 2387840. Its totient is φ = 1049760.

The previous prime is 1681661. The next prime is 1681679. The reversal of 1681671 is 1761861.

It is a happy number.

It is not a de Polignac number, because 1681671 - 2⁵ = 1681639 is a prime.

It is a Duffinian number.

1681671 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9201 + ... + 9381.

It is an arithmetic number, because the mean of its divisors is an integer number (149240).

2^1681671 is an apocalyptic number.

1681671 is a deficient number, since it is larger than the sum of its proper divisors (706169).

1681671 is a wasteful number, since it uses less digits than its factorization.

1681671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366.

The product of its digits is 2016, while the sum is 30.

The square root of 1681671 is about 1296.7925817184. The cubic root of 1681671 is about 118.9178398583.

The spelling of 1681671 in words is "one million, six hundred eighty-one thousand, six hundred seventy-one".