635563 has 2 divisors, whose sum is σ = 635564. Its totient is φ = 635562.

The previous prime is 635533. The next prime is 635567. The reversal of 635563 is 365536.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 635563 - 2⁹ = 635051 is a prime.

It is not a weakly prime, because it can be changed into another prime (635567) 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, 317781 + 317782.

It is an arithmetic number, because the mean of its divisors is an integer number (317782).

2⁶³⁵⁵⁶³ is an apocalyptic number.

635563 is a deficient number, since it is larger than the sum of its proper divisors (1).

635563 is an equidigital number, since it uses as much as digits as its factorization.

635563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 28.

The square root of 635563 is about 797.2220518776. Note that the first 3 decimals coincide. The cubic root of 635563 is about 85.9777750393.

The spelling of 635563 in words is "six hundred thirty-five thousand, five hundred sixty-three".