671717187 has 12 divisors (see below), whose sum is σ = 979161040. Its totient is φ = 443702448.

The previous prime is 671717173. The next prime is 671717191. The reversal of 671717187 is 781717176.

It is not a de Polignac number, because 671717187 - 2⁸ = 671716931 is a prime.

It is a super-2 number, since 2×671717187² = 902407958622385938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671717287) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 341383 + ... + 343344.

Almost surely, 2^671717187 is an apocalyptic number.

671717187 is a deficient number, since it is larger than the sum of its proper divisors (307443853).

671717187 is a wasteful number, since it uses less digits than its factorization.

671717187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684842 (or 684839 counting only the distinct ones).

The product of its digits is 115248, while the sum is 45.

The square root of 671717187 is about 25917.5073454219. The cubic root of 671717187 is about 875.7809352453.

The spelling of 671717187 in words is "six hundred seventy-one million, seven hundred seventeen thousand, one hundred eighty-seven".