636046221 has 8 divisors (see below), whose sum is σ = 848253280. Its totient is φ = 423934992.

The previous prime is 636046219. The next prime is 636046247. The reversal of 636046221 is 122640636.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 636046221 - 2¹ = 636046219 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 (636046121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6691 + ... + 36288.

It is an arithmetic number, because the mean of its divisors is an integer number (106031660).

Almost surely, 2^636046221 is an apocalyptic number.

It is an amenable number.

636046221 is a deficient number, since it is larger than the sum of its proper divisors (212207059).

636046221 is a wasteful number, since it uses less digits than its factorization.

636046221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47915.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 636046221 is about 25219.9568001216. The cubic root of 636046221 is about 859.9955926401.

Adding to 636046221 its reverse (122640636), we get a palindrome (758686857).

The spelling of 636046221 in words is "six hundred thirty-six million, forty-six thousand, two hundred twenty-one".