636393941 has 2 divisors, whose sum is σ = 636393942. Its totient is φ = 636393940.

The previous prime is 636393917. The next prime is 636393943. The reversal of 636393941 is 149393636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386279716 + 250114225 = 19654^2 + 15815^2 .

It is a cyclic number.

It is not a de Polignac number, because 636393941 - 2¹⁰ = 636392917 is a prime.

It is a super-2 number, since 2×636393941² = 809994496283022962, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 636393943, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 636393892 and 636393901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636393943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318196970 + 318196971.

It is an arithmetic number, because the mean of its divisors is an integer number (318196971).

Almost surely, 2^636393941 is an apocalyptic number.

It is an amenable number.

636393941 is a deficient number, since it is larger than the sum of its proper divisors (1).

636393941 is an equidigital number, since it uses as much as digits as its factorization.

636393941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 44.

The square root of 636393941 is about 25226.8496051330. The cubic root of 636393941 is about 860.1522810382.

The spelling of 636393941 in words is "six hundred thirty-six million, three hundred ninety-three thousand, nine hundred forty-one".