671695 has 4 divisors (see below), whose sum is σ = 806040. Its totient is φ = 537352.

The previous prime is 671681. The next prime is 671701. The reversal of 671695 is 596176.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671695 is a prime.

It is a plaindrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 671695.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67165 + ... + 67174.

It is an arithmetic number, because the mean of its divisors is an integer number (201510).

2⁶⁷¹⁶⁹⁵ is an apocalyptic number.

671695 is a deficient number, since it is larger than the sum of its proper divisors (134345).

671695 is a wasteful number, since it uses less digits than its factorization.

671695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134344.

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

The square root of 671695 is about 819.5700092121. The cubic root of 671695 is about 87.5771292712.

The spelling of 671695 in words is "six hundred seventy-one thousand, six hundred ninety-five".