636424643 has 2 divisors, whose sum is σ = 636424644. Its totient is φ = 636424642.

The previous prime is 636424619. The next prime is 636424669. The reversal of 636424643 is 346424636.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 636424643 - 2⁸ = 636424387 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 636424597 and 636424606.

It is not a weakly prime, because it can be changed into another prime (636424693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318212321 + 318212322.

It is an arithmetic number, because the mean of its divisors is an integer number (318212322).

Almost surely, 2^636424643 is an apocalyptic number.

636424643 is a deficient number, since it is larger than the sum of its proper divisors (1).

636424643 is an equidigital number, since it uses as much as digits as its factorization.

636424643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 38.

The square root of 636424643 is about 25227.4581161083. The cubic root of 636424643 is about 860.1661131260.

The spelling of 636424643 in words is "six hundred thirty-six million, four hundred twenty-four thousand, six hundred forty-three".