635505257 has 2 divisors, whose sum is σ = 635505258. Its totient is φ = 635505256.

The previous prime is 635505197. The next prime is 635505263. The reversal of 635505257 is 752505536.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 521848336 + 113656921 = 22844^2 + 10661^2 .

It is a cyclic number.

It is not a de Polignac number, because 635505257 - 2⁶ = 635505193 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 635505257.

It is not a weakly prime, because it can be changed into another prime (635505757) 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, 317752628 + 317752629.

It is an arithmetic number, because the mean of its divisors is an integer number (317752629).

Almost surely, 2^635505257 is an apocalyptic number.

It is an amenable number.

635505257 is a deficient number, since it is larger than the sum of its proper divisors (1).

635505257 is an equidigital number, since it uses as much as digits as its factorization.

635505257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157500, while the sum is 38.

The square root of 635505257 is about 25209.2295994939. The cubic root of 635505257 is about 859.7517117207.

The spelling of 635505257 in words is "six hundred thirty-five million, five hundred five thousand, two hundred fifty-seven".