638474113 has 2 divisors, whose sum is σ = 638474114. Its totient is φ = 638474112.

The previous prime is 638474077. The next prime is 638474141. The reversal of 638474113 is 311474836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 554696704 + 83777409 = 23552^2 + 9153^2 .

It is a cyclic number.

It is not a de Polignac number, because 638474113 - 2²⁵ = 604919681 is a prime.

It is a super-2 number, since 2×638474113² = 815298385942273538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (638474143) 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, 319237056 + 319237057.

It is an arithmetic number, because the mean of its divisors is an integer number (319237057).

Almost surely, 2^638474113 is an apocalyptic number.

It is an amenable number.

638474113 is a deficient number, since it is larger than the sum of its proper divisors (1).

638474113 is an equidigital number, since it uses as much as digits as its factorization.

638474113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 37.

The square root of 638474113 is about 25268.0452944030. The cubic root of 638474113 is about 861.0884510178.

The spelling of 638474113 in words is "six hundred thirty-eight million, four hundred seventy-four thousand, one hundred thirteen".