638930101 has 8 divisors (see below), whose sum is σ = 655075008. Its totient is φ = 622812000.

The previous prime is 638930053. The next prime is 638930111. The reversal of 638930101 is 101039836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 638930101 - 2¹¹ = 638928053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638930111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46896 + ... + 58966.

It is an arithmetic number, because the mean of its divisors is an integer number (81884376).

Almost surely, 2^638930101 is an apocalyptic number.

It is an amenable number.

638930101 is a deficient number, since it is larger than the sum of its proper divisors (16144907).

638930101 is a wasteful number, since it uses less digits than its factorization.

638930101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13403.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 638930101 is about 25277.0667008654. The cubic root of 638930101 is about 861.2933941032.

Adding to 638930101 its reverse (101039836), we get a palindrome (739969937).

The spelling of 638930101 in words is "six hundred thirty-eight million, nine hundred thirty thousand, one hundred one".