636001 has 4 divisors (see below), whose sum is σ = 637632. Its totient is φ = 634372.

The previous prime is 635989. The next prime is 636017. The reversal of 636001 is 100636.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 636001 - 2⁵ = 635969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156 + ... + 1138.

It is an arithmetic number, because the mean of its divisors is an integer number (159408).

2⁶³⁶⁰⁰¹ is an apocalyptic number.

It is an amenable number.

636001 is a deficient number, since it is larger than the sum of its proper divisors (1631).

636001 is an equidigital number, since it uses as much as digits as its factorization.

636001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 636001 is about 797.4967084572. The cubic root of 636001 is about 85.9975211112.

Adding to 636001 its reverse (100636), we get a palindrome (736637).

The spelling of 636001 in words is "six hundred thirty-six thousand, one".