671919571 has 4 divisors (see below), whose sum is σ = 671974600. Its totient is φ = 671864544.

The previous prime is 671919557. The next prime is 671919587. The reversal of 671919571 is 175919176.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 671919571 - 2¹⁷ = 671788499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671919511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81 + ... + 36658.

It is an arithmetic number, because the mean of its divisors is an integer number (167993650).

Almost surely, 2^671919571 is an apocalyptic number.

671919571 is a deficient number, since it is larger than the sum of its proper divisors (55029).

671919571 is a wasteful number, since it uses less digits than its factorization.

671919571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55028.

The product of its digits is 119070, while the sum is 46.

The square root of 671919571 is about 25921.4114391944. The cubic root of 671919571 is about 875.8688821047.

The spelling of 671919571 in words is "six hundred seventy-one million, nine hundred nineteen thousand, five hundred seventy-one".