636253 has 4 divisors (see below), whose sum is σ = 669760. Its totient is φ = 602748.

The previous prime is 636247. The next prime is 636257. The reversal of 636253 is 352636.

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.

It is a cyclic number.

It is not a de Polignac number, because 636253 - 2¹⁷ = 505181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636257) 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, 16725 + ... + 16762.

It is an arithmetic number, because the mean of its divisors is an integer number (167440).

2⁶³⁶²⁵³ is an apocalyptic number.

It is an amenable number.

636253 is a deficient number, since it is larger than the sum of its proper divisors (33507).

636253 is a wasteful number, since it uses less digits than its factorization.

636253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33506.

The product of its digits is 3240, while the sum is 25.

The square root of 636253 is about 797.6546871924. The cubic root of 636253 is about 86.0088777567.

Adding to 636253 its reverse (352636), we get a palindrome (988889).

The spelling of 636253 in words is "six hundred thirty-six thousand, two hundred fifty-three".