646562201 has 4 divisors (see below), whose sum is σ = 647168100. Its totient is φ = 645956304.

The previous prime is 646562197. The next prime is 646562237. The reversal of 646562201 is 102265646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 194574601 + 451987600 = 13949^2 + 21260^2 .

It is a cyclic number.

It is not a de Polignac number, because 646562201 - 2² = 646562197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (646562291) 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, 301346 + ... + 303483.

It is an arithmetic number, because the mean of its divisors is an integer number (161792025).

Almost surely, 2^646562201 is an apocalyptic number.

It is an amenable number.

646562201 is a deficient number, since it is larger than the sum of its proper divisors (605899).

646562201 is a wasteful number, since it uses less digits than its factorization.

646562201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605898.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 646562201 is about 25427.5874003021. The cubic root of 646562201 is about 864.7092481771.

The spelling of 646562201 in words is "six hundred forty-six million, five hundred sixty-two thousand, two hundred one".