671318691 has 16 divisors (see below), whose sum is σ = 908893440. Its totient is φ = 440681120.

The previous prime is 671318689. The next prime is 671318699. The reversal of 671318691 is 196813176.

It is a cyclic number.

It is not a de Polignac number, because 671318691 - 2¹ = 671318689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671318699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73105 + ... + 81773.

It is an arithmetic number, because the mean of its divisors is an integer number (56805840).

Almost surely, 2^671318691 is an apocalyptic number.

671318691 is a deficient number, since it is larger than the sum of its proper divisors (237574749).

671318691 is a wasteful number, since it uses less digits than its factorization.

671318691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9066.

The product of its digits is 54432, while the sum is 42.

The square root of 671318691 is about 25909.8184285417. The cubic root of 671318691 is about 875.6077154028.

The spelling of 671318691 in words is "six hundred seventy-one million, three hundred eighteen thousand, six hundred ninety-one".