671187 has 18 divisors (see below), whose sum is σ = 1007076. Its totient is φ = 397320.

The previous prime is 671161. The next prime is 671189. The reversal of 671187 is 781176.

It is not a de Polignac number, because 671187 - 2⁶ = 671123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671189) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15588 + ... + 15630.

2⁶⁷¹¹⁸⁷ is an apocalyptic number.

671187 is a deficient number, since it is larger than the sum of its proper divisors (335889).

671187 is a wasteful number, since it uses less digits than its factorization.

671187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 57 counting only the distinct ones).

The product of its digits is 2352, while the sum is 30.

The square root of 671187 is about 819.2600319801. The cubic root of 671187 is about 87.5550456360. Note that the first 3 decimals are identical.

Multiplying 671187 by its product of digits (2352), we get a square (1578631824 = 39732²).

It can be divided in two parts, 671 and 187, that added together give a palindrome (858).

The spelling of 671187 in words is "six hundred seventy-one thousand, one hundred eighty-seven".