671551111 has 8 divisors (see below), whose sum is σ = 837258624. Its totient is φ = 523286520.

The previous prime is 671551099. The next prime is 671551151. The reversal of 671551111 is 111155176.

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 671551111 - 2²⁵ = 637996679 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 671551111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671551151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4360645 + ... + 4360798.

It is an arithmetic number, because the mean of its divisors is an integer number (104657328).

Almost surely, 2^671551111 is an apocalyptic number.

671551111 is a deficient number, since it is larger than the sum of its proper divisors (165707513).

671551111 is a wasteful number, since it uses less digits than its factorization.

671551111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8721461.

The product of its digits is 1050, while the sum is 28.

The square root of 671551111 is about 25914.3032127048. The cubic root of 671551111 is about 875.7087529907.

The spelling of 671551111 in words is "six hundred seventy-one million, five hundred fifty-one thousand, one hundred eleven".