636863 has 2 divisors, whose sum is σ = 636864. Its totient is φ = 636862.

The previous prime is 636851. The next prime is 636877. The reversal of 636863 is 368636.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 636863 - 2¹⁸ = 374719 is a prime.

It is a Chen prime.

It is a plaindrome in base 8.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318431 + 318432.

It is an arithmetic number, because the mean of its divisors is an integer number (318432).

2⁶³⁶⁸⁶³ is an apocalyptic number.

636863 is a deficient number, since it is larger than the sum of its proper divisors (1).

636863 is an equidigital number, since it uses as much as digits as its factorization.

636863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 32.

The square root of 636863 is about 798.0369665623. The cubic root of 636863 is about 86.0363556402.

The spelling of 636863 in words is "six hundred thirty-six thousand, eight hundred sixty-three".