638302001 has 4 divisors (see below), whose sum is σ = 644882532. Its totient is φ = 631721472.

The previous prime is 638301991. The next prime is 638302051. The reversal of 638302001 is 100203836.

638302001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 241336225 + 396965776 = 15535^2 + 19924^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638302001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638302051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3290120 + ... + 3290313.

It is an arithmetic number, because the mean of its divisors is an integer number (161220633).

Almost surely, 2^638302001 is an apocalyptic number.

It is an amenable number.

638302001 is a deficient number, since it is larger than the sum of its proper divisors (6580531).

638302001 is an equidigital number, since it uses as much as digits as its factorization.

638302001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6580530.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 638302001 is about 25264.6393403904. The cubic root of 638302001 is about 861.0110701857.

Adding to 638302001 its reverse (100203836), we get a palindrome (738505837).

The spelling of 638302001 in words is "six hundred thirty-eight million, three hundred two thousand, one".