638051 has 2 divisors, whose sum is σ = 638052. Its totient is φ = 638050.

The previous prime is 638047. The next prime is 638059. The reversal of 638051 is 150836.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638051 - 2² = 638047 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638051.

It is not a weakly prime, because it can be changed into another prime (638059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319025 + 319026.

It is an arithmetic number, because the mean of its divisors is an integer number (319026).

2⁶³⁸⁰⁵¹ is an apocalyptic number.

638051 is a deficient number, since it is larger than the sum of its proper divisors (1).

638051 is an equidigital number, since it uses as much as digits as its factorization.

638051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 638051 is about 798.7809461924. The cubic root of 638051 is about 86.0898196252.

Adding to 638051 its reverse (150836), we get a palindrome (788887).

The spelling of 638051 in words is "six hundred thirty-eight thousand, fifty-one".