671555071 has 4 divisors (see below), whose sum is σ = 732605544. Its totient is φ = 610504600.

The previous prime is 671555041. The next prime is 671555083. The reversal of 671555071 is 170555176.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671555071 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 671555071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671555011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30525220 + ... + 30525241.

It is an arithmetic number, because the mean of its divisors is an integer number (183151386).

Almost surely, 2^671555071 is an apocalyptic number.

671555071 is a deficient number, since it is larger than the sum of its proper divisors (61050473).

671555071 is a wasteful number, since it uses less digits than its factorization.

671555071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61050472.

The product of its (nonzero) digits is 36750, while the sum is 37.

The square root of 671555071 is about 25914.3796182737. The cubic root of 671555071 is about 875.7104742794.

The spelling of 671555071 in words is "six hundred seventy-one million, five hundred fifty-five thousand, seventy-one".