639563 has 2 divisors, whose sum is σ = 639564. Its totient is φ = 639562.

The previous prime is 639547. The next prime is 639571. The reversal of 639563 is 365936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639563 - 2⁴ = 639547 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (639533) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319781 + 319782.

It is an arithmetic number, because the mean of its divisors is an integer number (319782).

2⁶³⁹⁵⁶³ is an apocalyptic number.

639563 is a deficient number, since it is larger than the sum of its proper divisors (1).

639563 is an equidigital number, since it uses as much as digits as its factorization.

639563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 32.

The square root of 639563 is about 799.7268283608. The cubic root of 639563 is about 86.1577688028.

The spelling of 639563 in words is "six hundred thirty-nine thousand, five hundred sixty-three".