638469011 has 2 divisors, whose sum is σ = 638469012. Its totient is φ = 638469010.

The previous prime is 638468977. The next prime is 638469047. The reversal of 638469011 is 110964836.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638469011 - 2⁶ = 638468947 is a prime.

It is not a weakly prime, because it can be changed into another prime (638469511) 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, 319234505 + 319234506.

It is an arithmetic number, because the mean of its divisors is an integer number (319234506).

Almost surely, 2^638469011 is an apocalyptic number.

638469011 is a deficient number, since it is larger than the sum of its proper divisors (1).

638469011 is an equidigital number, since it uses as much as digits as its factorization.

638469011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 638469011 is about 25267.9443366492. The cubic root of 638469011 is about 861.0861573801.

The spelling of 638469011 in words is "six hundred thirty-eight million, four hundred sixty-nine thousand, eleven".