636223541 has 2 divisors, whose sum is σ = 636223542. Its totient is φ = 636223540.

The previous prime is 636223529. The next prime is 636223573. The reversal of 636223541 is 145322636.

It is an a-pointer prime, because the next prime (636223573) can be obtained adding 636223541 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388287025 + 247936516 = 19705^2 + 15746^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636223541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 636223498 and 636223507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636223591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318111770 + 318111771.

It is an arithmetic number, because the mean of its divisors is an integer number (318111771).

Almost surely, 2^636223541 is an apocalyptic number.

It is an amenable number.

636223541 is a deficient number, since it is larger than the sum of its proper divisors (1).

636223541 is an equidigital number, since it uses as much as digits as its factorization.

636223541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 32.

The square root of 636223541 is about 25223.4720250801. The cubic root of 636223541 is about 860.0755031061.

The spelling of 636223541 in words is "six hundred thirty-six million, two hundred twenty-three thousand, five hundred forty-one".