671659 has 4 divisors (see below), whose sum is σ = 673416. Its totient is φ = 669904.

The previous prime is 671651. The next prime is 671681. The reversal of 671659 is 956176.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 671659 - 2³ = 671651 is a prime.

It is a super-2 number, since 2×671659² = 902251624562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34 + ... + 1159.

It is an arithmetic number, because the mean of its divisors is an integer number (168354).

2⁶⁷¹⁶⁵⁹ is an apocalyptic number.

671659 is a deficient number, since it is larger than the sum of its proper divisors (1757).

671659 is a wasteful number, since it uses less digits than its factorization.

671659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756.

The product of its digits is 11340, while the sum is 34.

The square root of 671659 is about 819.5480461816. The cubic root of 671659 is about 87.5755646558.

The spelling of 671659 in words is "six hundred seventy-one thousand, six hundred fifty-nine".