647167 has 4 divisors (see below), whose sum is σ = 664696. Its totient is φ = 629640.

The previous prime is 647161. The next prime is 647189. The reversal of 647167 is 761746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 647167 - 2⁷ = 647039 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8709 + ... + 8782.

It is an arithmetic number, because the mean of its divisors is an integer number (166174).

2⁶⁴⁷¹⁶⁷ is an apocalyptic number.

647167 is a deficient number, since it is larger than the sum of its proper divisors (17529).

647167 is a wasteful number, since it uses less digits than its factorization.

647167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17528.

The product of its digits is 7056, while the sum is 31.

The square root of 647167 is about 804.4669042291. The cubic root of 647167 is about 86.4978782600.

The spelling of 647167 in words is "six hundred forty-seven thousand, one hundred sixty-seven".