636143 has 4 divisors (see below), whose sum is σ = 641280. Its totient is φ = 631008.

The previous prime is 636137. The next prime is 636149. The reversal of 636143 is 341636.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (636137) and next prime (636149).

It is a cyclic number.

It is not a de Polignac number, because 636143 - 2¹⁰ = 635119 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 636143.

It is not an unprimeable number, because it can be changed into a prime (636149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2378 + ... + 2631.

It is an arithmetic number, because the mean of its divisors is an integer number (160320).

2⁶³⁶¹⁴³ is an apocalyptic number.

636143 is a deficient number, since it is larger than the sum of its proper divisors (5137).

636143 is a wasteful number, since it uses less digits than its factorization.

636143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5136.

The product of its digits is 1296, while the sum is 23.

The square root of 636143 is about 797.5857320690. The cubic root of 636143 is about 86.0039208596.

Adding to 636143 its reverse (341636), we get a palindrome (977779).

The spelling of 636143 in words is "six hundred thirty-six thousand, one hundred forty-three".