647805313 has 4 divisors (see below), whose sum is σ = 647880880. Its totient is φ = 647729748.

The previous prime is 647805307. The next prime is 647805331. The reversal of 647805313 is 313508746.

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 an emirpimes, since its reverse is a distinct semiprime: 313508746 = 2 ⋅156754373.

It is a cyclic number.

It is not a de Polignac number, because 647805313 - 2²⁵ = 614250881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647805113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22995 + ... + 42712.

It is an arithmetic number, because the mean of its divisors is an integer number (161970220).

Almost surely, 2^647805313 is an apocalyptic number.

It is an amenable number.

647805313 is a deficient number, since it is larger than the sum of its proper divisors (75567).

647805313 is an equidigital number, since it uses as much as digits as its factorization.

647805313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75566.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 647805313 is about 25452.0198216173. The cubic root of 647805313 is about 865.2630707749.

The spelling of 647805313 in words is "six hundred forty-seven million, eight hundred five thousand, three hundred thirteen".