636731 has 2 divisors, whose sum is σ = 636732.
Its totient is φ = 636730.
The previous prime is 636721. The next prime is 636739. The reversal of 636731 is 137636.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 636731 - 210 = 635707 is a prime.
It is a super-2 number, since 2×6367312 = 810852732722, which contains 22 as substring.
It is a Sophie Germain prime.
It is a Chen prime.
It is equal to p51848 and since 636731 and 51848 have the same sum of digits, it is a Honaker prime.
It is a self number, because there is not a number n which added to its sum of digits gives 636731.
It is not a weakly prime, because it can be changed into another prime (636739) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318365 + 318366.
It is an arithmetic number, because the mean of its divisors is an integer number (318366).
2636731 is an apocalyptic number.
636731 is a deficient number, since it is larger than the sum of its proper divisors (1).
636731 is an equidigital number, since it uses as much as digits as its factorization.
636731 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 2268, while the sum is 26.
The square root of 636731 is about 797.9542593407.
The cubic root of 636731 is about 86.0304110945.
The spelling of 636731 in words is "six hundred thirty-six thousand, seven hundred thirty-one".