646247171 has 8 divisors (see below), whose sum is σ = 680505600. Its totient is φ = 612013320.

The previous prime is 646247167. The next prime is 646247177. The reversal of 646247171 is 171742646.

It is a happy number.

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 646247171 - 2² = 646247167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646247177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76370 + ... + 84408.

It is an arithmetic number, because the mean of its divisors is an integer number (85063200).

Almost surely, 2^646247171 is an apocalyptic number.

646247171 is a deficient number, since it is larger than the sum of its proper divisors (34258429).

646247171 is a wasteful number, since it uses less digits than its factorization.

646247171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12289.

The product of its digits is 56448, while the sum is 38.

The square root of 646247171 is about 25421.3919957189. The cubic root of 646247171 is about 864.5687854814.

The spelling of 646247171 in words is "six hundred forty-six million, two hundred forty-seven thousand, one hundred seventy-one".