639011 has 2 divisors, whose sum is σ = 639012. Its totient is φ = 639010.

The previous prime is 639007. The next prime is 639043. The reversal of 639011 is 110936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639011 - 2² = 639007 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (639091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319505 + 319506.

It is an arithmetic number, because the mean of its divisors is an integer number (319506).

2⁶³⁹⁰¹¹ is an apocalyptic number.

639011 is a deficient number, since it is larger than the sum of its proper divisors (1).

639011 is an equidigital number, since it uses as much as digits as its factorization.

639011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 639011 is about 799.3816360162. The cubic root of 639011 is about 86.1329743846.

Adding to 639011 its reverse (110936), we get a palindrome (749947).

The spelling of 639011 in words is "six hundred thirty-nine thousand, eleven".