636242101 has 4 divisors (see below), whose sum is σ = 694082304. Its totient is φ = 578401900.

The previous prime is 636242071. The next prime is 636242129. The reversal of 636242101 is 101242636.

636242101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 636242101 - 2²⁵ = 602687669 is a prime.

It is a super-2 number, since 2×636242101² = 809608022169788402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636242161) 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, 28920085 + ... + 28920106.

It is an arithmetic number, because the mean of its divisors is an integer number (173520576).

Almost surely, 2^636242101 is an apocalyptic number.

It is an amenable number.

636242101 is a deficient number, since it is larger than the sum of its proper divisors (57840203).

636242101 is a wasteful number, since it uses less digits than its factorization.

636242101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57840202.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 636242101 is about 25223.8399336818. The cubic root of 636242101 is about 860.0838664381.

Adding to 636242101 its reverse (101242636), we get a palindrome (737484737).

The spelling of 636242101 in words is "six hundred thirty-six million, two hundred forty-two thousand, one hundred one".