647071313 has 6 divisors (see below), whose sum is σ = 752715666. Its totient is φ = 554632512.

The previous prime is 647071309. The next prime is 647071319. The reversal of 647071313 is 313170746.

It can be written as a sum of positive squares in only one way, i.e., 349577809 + 297493504 = 18697^2 + 17248^2 .

It is not a de Polignac number, because 647071313 - 2² = 647071309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647071313.

It is not an unprimeable number, because it can be changed into a prime (647071319) 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, 6602720 + ... + 6602817.

It is an arithmetic number, because the mean of its divisors is an integer number (125452611).

Almost surely, 2^647071313 is an apocalyptic number.

It is an amenable number.

647071313 is a deficient number, since it is larger than the sum of its proper divisors (105644353).

647071313 is a wasteful number, since it uses less digits than its factorization.

647071313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13205551 (or 13205544 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 647071313 is about 25437.5964469916. The cubic root of 647071313 is about 864.9361499642.

The spelling of 647071313 in words is "six hundred forty-seven million, seventy-one thousand, three hundred thirteen".