671012111 has 16 divisors (see below), whose sum is σ = 837941760. Its totient is φ = 522019680.

The previous prime is 671012107. The next prime is 671012123. The reversal of 671012111 is 111210176.

It is a happy number.

It is not a de Polignac number, because 671012111 - 2² = 671012107 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 (671012101) 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, 43085 + ... + 56553.

It is an arithmetic number, because the mean of its divisors is an integer number (52371360).

Almost surely, 2^671012111 is an apocalyptic number.

671012111 is a deficient number, since it is larger than the sum of its proper divisors (166929649).

671012111 is a wasteful number, since it uses less digits than its factorization.

671012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14134.

The product of its (nonzero) digits is 84, while the sum is 20.

The square root of 671012111 is about 25903.9014629071. The cubic root of 671012111 is about 875.4744033152.

Adding to 671012111 its reverse (111210176), we get a palindrome (782222287).

The spelling of 671012111 in words is "six hundred seventy-one million, twelve thousand, one hundred eleven".