671494563 has 12 divisors (see below), whose sum is σ = 995006280. Its totient is φ = 447573276.

The previous prime is 671494547. The next prime is 671494573. The reversal of 671494563 is 365494176.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 671494563 - 2⁴ = 671494547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671494573) 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 11 ways as a sum of consecutive naturals, for example, 132156 + ... + 137142.

It is an arithmetic number, because the mean of its divisors is an integer number (82917190).

Almost surely, 2^671494563 is an apocalyptic number.

671494563 is a deficient number, since it is larger than the sum of its proper divisors (323511717).

671494563 is an frugal number, since it uses more digits than its factorization.

671494563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9983 (or 4990 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 671494563 is about 25913.2121320380. The cubic root of 671494563 is about 875.6841725988.

The spelling of 671494563 in words is "six hundred seventy-one million, four hundred ninety-four thousand, five hundred sixty-three".