647389313 has 4 divisors (see below), whose sum is σ = 647440320. Its totient is φ = 647338308.

The previous prime is 647389297. The next prime is 647389319. The reversal of 647389313 is 313983746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, 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 647389313 - 2⁴ = 647389297 is a prime.

It is a super-2 number, since 2×647389313² = 838225845173223938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647389319) 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 3 ways as a sum of consecutive naturals, for example, 10148 + ... + 37386.

It is an arithmetic number, because the mean of its divisors is an integer number (161860080).

Almost surely, 2^647389313 is an apocalyptic number.

It is an amenable number.

647389313 is a deficient number, since it is larger than the sum of its proper divisors (51007).

647389313 is a wasteful number, since it uses less digits than its factorization.

647389313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51006.

The product of its digits is 326592, while the sum is 44.

The square root of 647389313 is about 25443.8462697761. The cubic root of 647389313 is about 865.0778162923.

The spelling of 647389313 in words is "six hundred forty-seven million, three hundred eighty-nine thousand, three hundred thirteen".