671027191 has 4 divisors (see below), whose sum is σ = 671333992. Its totient is φ = 670720392.

The previous prime is 671027173. The next prime is 671027207. The reversal of 671027191 is 191720176.

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

It is a cyclic number.

It is not a de Polignac number, because 671027191 - 2¹⁷ = 670896119 is a prime.

It is a super-2 number, since 2×671027191² = 900554982122700962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671027101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150096 + ... + 154501.

It is an arithmetic number, because the mean of its divisors is an integer number (167833498).

Almost surely, 2^671027191 is an apocalyptic number.

671027191 is a deficient number, since it is larger than the sum of its proper divisors (306801).

671027191 is a wasteful number, since it uses less digits than its factorization.

671027191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306800.

The product of its (nonzero) digits is 5292, while the sum is 34.

The square root of 671027191 is about 25904.1925371165. The cubic root of 671027191 is about 875.4809615948.

The spelling of 671027191 in words is "six hundred seventy-one million, twenty-seven thousand, one hundred ninety-one".