671065 has 4 divisors (see below), whose sum is σ = 805284. Its totient is φ = 536848.

The previous prime is 671063. The next prime is 671081. The reversal of 671065 is 560176.

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

It can be written as a sum of positive squares in 2 ways, for example, as 369664 + 301401 = 608^2 + 549^2 .

It is a cyclic number.

It is not a de Polignac number, because 671065 - 2¹ = 671063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67102 + ... + 67111.

It is an arithmetic number, because the mean of its divisors is an integer number (201321).

2⁶⁷¹⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

671065 is a deficient number, since it is larger than the sum of its proper divisors (134219).

671065 is a wasteful number, since it uses less digits than its factorization.

671065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134218.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 671065 is about 819.1855711620. The cubic root of 671065 is about 87.5497404266.

Subtracting from 671065 its reverse (560176), we obtain a square (110889 = 333²).

The spelling of 671065 in words is "six hundred seventy-one thousand, sixty-five".