643201011 has 12 divisors (see below), whose sum is σ = 929540040. Its totient is φ = 428582880.

The previous prime is 643200991. The next prime is 643201021. The reversal of 643201011 is 110102346.

It is a happy number.

643201011 is a `hidden beast` number, since 643 + 2 + 0 + 10 + 11 = 666.

It is not a de Polignac number, because 643201011 - 2⁵ = 643200979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643201021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1696 + ... + 35906.

It is an arithmetic number, because the mean of its divisors is an integer number (77461670).

Almost surely, 2^643201011 is an apocalyptic number.

643201011 is a deficient number, since it is larger than the sum of its proper divisors (286339029).

643201011 is a wasteful number, since it uses less digits than its factorization.

643201011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36306 (or 36303 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 643201011 is about 25361.4079065024. The cubic root of 643201011 is about 863.2082308884.

Adding to 643201011 its reverse (110102346), we get a palindrome (753303357).

The spelling of 643201011 in words is "six hundred forty-three million, two hundred one thousand, eleven".