638273113 has 4 divisors (see below), whose sum is σ = 651853440. Its totient is φ = 624692788.

The previous prime is 638273087. The next prime is 638273179. The reversal of 638273113 is 311372836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638273113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638273183) 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, 6790093 + ... + 6790186.

It is an arithmetic number, because the mean of its divisors is an integer number (162963360).

Almost surely, 2^638273113 is an apocalyptic number.

It is an amenable number.

638273113 is a deficient number, since it is larger than the sum of its proper divisors (13580327).

638273113 is a wasteful number, since it uses less digits than its factorization.

638273113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13580326.

The product of its digits is 18144, while the sum is 34.

The square root of 638273113 is about 25264.0676257803. The cubic root of 638273113 is about 860.9980808990.

The spelling of 638273113 in words is "six hundred thirty-eight million, two hundred seventy-three thousand, one hundred thirteen".