636216223 has 2 divisors, whose sum is σ = 636216224. Its totient is φ = 636216222.

The previous prime is 636216173. The next prime is 636216263. The reversal of 636216223 is 322612636.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 636216223 - 2⁹ = 636215711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636216263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318108111 + 318108112.

It is an arithmetic number, because the mean of its divisors is an integer number (318108112).

Almost surely, 2^636216223 is an apocalyptic number.

636216223 is a deficient number, since it is larger than the sum of its proper divisors (1).

636216223 is an equidigital number, since it uses as much as digits as its factorization.

636216223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 31.

The square root of 636216223 is about 25223.3269613665. The cubic root of 636216223 is about 860.0722054933.

Adding to 636216223 its reverse (322612636), we get a palindrome (958828859).

The spelling of 636216223 in words is "six hundred thirty-six million, two hundred sixteen thousand, two hundred twenty-three".