646534201 has 2 divisors, whose sum is σ = 646534202. Its totient is φ = 646534200.

The previous prime is 646534087. The next prime is 646534241. The reversal of 646534201 is 102435646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644906025 + 1628176 = 25395^2 + 1276^2 .

It is a cyclic number.

It is not a de Polignac number, because 646534201 - 2¹¹ = 646532153 is a prime.

It is not a weakly prime, because it can be changed into another prime (646534241) 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 as a sum of consecutive naturals, namely, 323267100 + 323267101.

It is an arithmetic number, because the mean of its divisors is an integer number (323267101).

Almost surely, 2^646534201 is an apocalyptic number.

It is an amenable number.

646534201 is a deficient number, since it is larger than the sum of its proper divisors (1).

646534201 is an equidigital number, since it uses as much as digits as its factorization.

646534201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 646534201 is about 25427.0368112370. The cubic root of 646534201 is about 864.6967656408.

Adding to 646534201 its reverse (102435646), we get a palindrome (748969847).

The spelling of 646534201 in words is "six hundred forty-six million, five hundred thirty-four thousand, two hundred one".