647137313 has 4 divisors (see below), whose sum is σ = 660906240. Its totient is φ = 633368388.

The previous prime is 647137277. The next prime is 647137333. The reversal of 647137313 is 313731746.

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.

It is a cyclic number.

It is not a de Polignac number, because 647137313 - 2¹⁰ = 647136289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647137333) 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, 6884393 + ... + 6884486.

It is an arithmetic number, because the mean of its divisors is an integer number (165226560).

Almost surely, 2^647137313 is an apocalyptic number.

It is an amenable number.

647137313 is a deficient number, since it is larger than the sum of its proper divisors (13768927).

647137313 is a wasteful number, since it uses less digits than its factorization.

647137313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13768926.

The product of its digits is 31752, while the sum is 35.

The square root of 647137313 is about 25438.8937062916. The cubic root of 647137313 is about 864.9655562259.

The spelling of 647137313 in words is "six hundred forty-seven million, one hundred thirty-seven thousand, three hundred thirteen".