646922317 has 4 divisors (see below), whose sum is σ = 680970880. Its totient is φ = 612873756.

The previous prime is 646922299. The next prime is 646922327. The reversal of 646922317 is 713229646.

It is a happy number.

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 646922317 - 2⁷ = 646922189 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 646922317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646922327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17024253 + ... + 17024290.

It is an arithmetic number, because the mean of its divisors is an integer number (170242720).

Almost surely, 2^646922317 is an apocalyptic number.

It is an amenable number.

646922317 is a deficient number, since it is larger than the sum of its proper divisors (34048563).

646922317 is a wasteful number, since it uses less digits than its factorization.

646922317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34048562.

The product of its digits is 108864, while the sum is 40.

The square root of 646922317 is about 25434.6676211819. The cubic root of 646922317 is about 864.8697575297.

The spelling of 646922317 in words is "six hundred forty-six million, nine hundred twenty-two thousand, three hundred seventeen".