1671 has 4 divisors (see below), whose sum is σ = 2232. Its totient is φ = 1112.
The previous prime is 1669. The next prime is 1693. The reversal of 1671 is 1761.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1761 = 3 ⋅587.
It is a cyclic number.
It is not a de Polignac number, because 1671 - 21 = 1669 is a prime.
It is a D-number.
It is a plaindrome in base 9 and base 11.
It is a nialpdrome in base 12, base 14 and base 15.
It is a self number, because there is not a number n which added to its sum of digits gives 1671.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1601) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276 + ... + 281.
It is an arithmetic number, because the mean of its divisors is an integer number (558).
1671 is a deficient number, since it is larger than the sum of its proper divisors (561).
1671 is an equidigital number, since it uses as much as digits as its factorization.
1671 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 560.
The product of its digits is 42, while the sum is 15.
The square root of 1671 is about 40.8778668719. The cubic root of 1671 is about 11.8665775919.
The spelling of 1671 in words is "one thousand, six hundred seventy-one".
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