636694543 has 2 divisors, whose sum is σ = 636694544. Its totient is φ = 636694542.

The previous prime is 636694493. The next prime is 636694549. The reversal of 636694543 is 345496636.

636694543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 636694543 - 2⁹ = 636694031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 636694493 and 636694502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636694549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318347271 + 318347272.

It is an arithmetic number, because the mean of its divisors is an integer number (318347272).

Almost surely, 2^636694543 is an apocalyptic number.

636694543 is a deficient number, since it is larger than the sum of its proper divisors (1).

636694543 is an equidigital number, since it uses as much as digits as its factorization.

636694543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 46.

The square root of 636694543 is about 25232.8068791405. The cubic root of 636694543 is about 860.2876912922.

The spelling of 636694543 in words is "six hundred thirty-six million, six hundred ninety-four thousand, five hundred forty-three".