646005317 has 4 divisors (see below), whose sum is σ = 646674336. Its totient is φ = 645336300.

The previous prime is 646005313. The next prime is 646005319. The reversal of 646005317 is 713500646.

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 646005317 - 2² = 646005313 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646005313) 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, 333059 + ... + 334992.

It is an arithmetic number, because the mean of its divisors is an integer number (161668584).

Almost surely, 2^646005317 is an apocalyptic number.

It is an amenable number.

646005317 is a deficient number, since it is larger than the sum of its proper divisors (669019).

646005317 is an equidigital number, since it uses as much as digits as its factorization.

646005317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669018.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 646005317 is about 25416.6346513460. The cubic root of 646005317 is about 864.4609188536.

The spelling of 646005317 in words is "six hundred forty-six million, five thousand, three hundred seventeen".