635799253 has 2 divisors, whose sum is σ = 635799254. Its totient is φ = 635799252.

The previous prime is 635799233. The next prime is 635799271. The reversal of 635799253 is 352997536.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 321198084 + 314601169 = 17922^2 + 17737^2 .

It is a cyclic number.

It is not a de Polignac number, because 635799253 - 2⁹ = 635798741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 635799197 and 635799206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (635799233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317899626 + 317899627.

It is an arithmetic number, because the mean of its divisors is an integer number (317899627).

Almost surely, 2^635799253 is an apocalyptic number.

It is an amenable number.

635799253 is a deficient number, since it is larger than the sum of its proper divisors (1).

635799253 is an equidigital number, since it uses as much as digits as its factorization.

635799253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1530900, while the sum is 49.

The square root of 635799253 is about 25215.0600435533. The cubic root of 635799253 is about 859.8842700769.

The spelling of 635799253 in words is "six hundred thirty-five million, seven hundred ninety-nine thousand, two hundred fifty-three".