638070133 has 2 divisors, whose sum is σ = 638070134. Its totient is φ = 638070132.

The previous prime is 638070131. The next prime is 638070203. The reversal of 638070133 is 331070836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 591802929 + 46267204 = 24327^2 + 6802^2 .

It is a cyclic number.

It is not a de Polignac number, because 638070133 - 2¹ = 638070131 is a prime.

Together with 638070131, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 638070095 and 638070104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638070131) 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, 319035066 + 319035067.

It is an arithmetic number, because the mean of its divisors is an integer number (319035067).

Almost surely, 2^638070133 is an apocalyptic number.

It is an amenable number.

638070133 is a deficient number, since it is larger than the sum of its proper divisors (1).

638070133 is an equidigital number, since it uses as much as digits as its factorization.

638070133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 638070133 is about 25260.0501385092. The cubic root of 638070133 is about 860.9068013114.

The spelling of 638070133 in words is "six hundred thirty-eight million, seventy thousand, one hundred thirty-three".