671111011 has 8 divisors (see below), whose sum is σ = 696714480. Its totient is φ = 645671712.

The previous prime is 671111009. The next prime is 671111029. The reversal of 671111011 is 110111176.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 671111011 - 2¹ = 671111009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671111011.

It is not an unprimeable number, because it can be changed into a prime (671111071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32680 + ... + 49093.

It is an arithmetic number, because the mean of its divisors is an integer number (87089310).

Almost surely, 2^671111011 is an apocalyptic number.

671111011 is a deficient number, since it is larger than the sum of its proper divisors (25603469).

671111011 is a wasteful number, since it uses less digits than its factorization.

671111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82085.

The product of its (nonzero) digits is 42, while the sum is 19.

The square root of 671111011 is about 25905.8103714205. The cubic root of 671111011 is about 875.5174130531.

Adding to 671111011 its reverse (110111176), we get a palindrome (781222187).

The spelling of 671111011 in words is "six hundred seventy-one million, one hundred eleven thousand, eleven".