638088133 has 2 divisors, whose sum is σ = 638088134. Its totient is φ = 638088132.

The previous prime is 638088107. The next prime is 638088151. The reversal of 638088133 is 331880836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 609003684 + 29084449 = 24678^2 + 5393^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638088133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638088163) 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, 319044066 + 319044067.

It is an arithmetic number, because the mean of its divisors is an integer number (319044067).

Almost surely, 2^638088133 is an apocalyptic number.

It is an amenable number.

638088133 is a deficient number, since it is larger than the sum of its proper divisors (1).

638088133 is an equidigital number, since it uses as much as digits as its factorization.

638088133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 638088133 is about 25260.4064298261. The cubic root of 638088133 is about 860.9148966476.

The spelling of 638088133 in words is "six hundred thirty-eight million, eighty-eight thousand, one hundred thirty-three".