671009 has 4 divisors (see below), whose sum is σ = 672816. Its totient is φ = 669204.

The previous prime is 671003. The next prime is 671017. The reversal of 671009 is 900176.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671003) 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, 119 + ... + 1164.

It is an arithmetic number, because the mean of its divisors is an integer number (168204).

2⁶⁷¹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

671009 is a deficient number, since it is larger than the sum of its proper divisors (1807).

671009 is a wasteful number, since it uses less digits than its factorization.

671009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 671009 is about 819.1513901594. The cubic root of 671009 is about 87.5473050332.

The spelling of 671009 in words is "six hundred seventy-one thousand, nine".