636959 has 4 divisors (see below), whose sum is σ = 651816. Its totient is φ = 622104.

The previous prime is 636953. The next prime is 636967. The reversal of 636959 is 959636.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 636959.

It is not an unprimeable number, because it can be changed into a prime (636953) 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 in 3 ways as a sum of consecutive naturals, for example, 7364 + ... + 7449.

It is an arithmetic number, because the mean of its divisors is an integer number (162954).

2⁶³⁶⁹⁵⁹ is an apocalyptic number.

636959 is a deficient number, since it is larger than the sum of its proper divisors (14857).

636959 is a wasteful number, since it uses less digits than its factorization.

636959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14856.

The product of its digits is 43740, while the sum is 38.

The square root of 636959 is about 798.0971118855. The cubic root of 636959 is about 86.0406784303.

The spelling of 636959 in words is "six hundred thirty-six thousand, nine hundred fifty-nine".