647582171 has 6 divisors (see below), whose sum is σ = 658756980. Its totient is φ = 636414048.

The previous prime is 647582141. The next prime is 647582213. The reversal of 647582171 is 171285746.

It is a de Polignac number, because none of the positive numbers 2^k-647582171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647582101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 193811 + ... + 197123.

It is an arithmetic number, because the mean of its divisors is an integer number (109792830).

Almost surely, 2^647582171 is an apocalyptic number.

647582171 is a deficient number, since it is larger than the sum of its proper divisors (11174809).

647582171 is an frugal number, since it uses more digits than its factorization.

647582171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6685 (or 3372 counting only the distinct ones).

The product of its digits is 94080, while the sum is 41.

The square root of 647582171 is about 25447.6358626887. The cubic root of 647582171 is about 865.1637103130.

The spelling of 647582171 in words is "six hundred forty-seven million, five hundred eighty-two thousand, one hundred seventy-one".