671305 has 16 divisors (see below), whose sum is σ = 857088. Its totient is φ = 504000.

The previous prime is 671303. The next prime is 671323. The reversal of 671305 is 503176.

671305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 671305 - 2¹ = 671303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671303) 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, 9420 + ... + 9490.

It is an arithmetic number, because the mean of its divisors is an integer number (53568).

2⁶⁷¹³⁰⁵ is an apocalyptic number.

It is an amenable number.

671305 is a deficient number, since it is larger than the sum of its proper divisors (185783).

671305 is a wasteful number, since it uses less digits than its factorization.

671305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 671305 is about 819.3320450220. The cubic root of 671305 is about 87.5601762926.

The spelling of 671305 in words is "six hundred seventy-one thousand, three hundred five".