671334591 has 4 divisors (see below), whose sum is σ = 895112792. Its totient is φ = 447556392.

The previous prime is 671334583. The next prime is 671334673. The reversal of 671334591 is 195433176.

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

It is not a de Polignac number, because 671334591 - 2³ = 671334583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671334541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111889096 + ... + 111889101.

It is an arithmetic number, because the mean of its divisors is an integer number (223778198).

Almost surely, 2^671334591 is an apocalyptic number.

671334591 is a deficient number, since it is larger than the sum of its proper divisors (223778201).

671334591 is a wasteful number, since it uses less digits than its factorization.

671334591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223778200.

The product of its digits is 68040, while the sum is 39.

The square root of 671334591 is about 25910.1252602144. The cubic root of 671334591 is about 875.6146281915.

The spelling of 671334591 in words is "six hundred seventy-one million, three hundred thirty-four thousand, five hundred ninety-one".