636697 has 2 divisors, whose sum is σ = 636698. Its totient is φ = 636696.

The previous prime is 636673. The next prime is 636719. The reversal of 636697 is 796636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 549081 + 87616 = 741^2 + 296^2 .

It is a cyclic number.

It is not a de Polignac number, because 636697 - 2⁷ = 636569 is a prime.

It is not a weakly prime, because it can be changed into another prime (636997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318348 + 318349.

It is an arithmetic number, because the mean of its divisors is an integer number (318349).

2⁶³⁶⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

636697 is a deficient number, since it is larger than the sum of its proper divisors (1).

636697 is an equidigital number, since it uses as much as digits as its factorization.

636697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 37.

The square root of 636697 is about 797.9329545770. The cubic root of 636697 is about 86.0288797906.

The spelling of 636697 in words is "six hundred thirty-six thousand, six hundred ninety-seven".