646317297 has 12 divisors (see below), whose sum is σ = 939753984. Its totient is φ = 428023800.

The previous prime is 646317293. The next prime is 646317337. The reversal of 646317297 is 792713646.

646317297 is a `hidden beast` number, since 6 + 4 + 631 + 7 + 2 + 9 + 7 = 666.

It is not a de Polignac number, because 646317297 - 2² = 646317293 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (646317293) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 236433 + ... + 239150.

It is an arithmetic number, because the mean of its divisors is an integer number (78312832).

Almost surely, 2^646317297 is an apocalyptic number.

It is an amenable number.

646317297 is a deficient number, since it is larger than the sum of its proper divisors (293436687).

646317297 is a wasteful number, since it uses less digits than its factorization.

646317297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475740 (or 475737 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 646317297 is about 25422.7712297460. The cubic root of 646317297 is about 864.6000565701.

The spelling of 646317297 in words is "six hundred forty-six million, three hundred seventeen thousand, two hundred ninety-seven".