635121736849 has 2 divisors, whose sum is σ = 635121736850. Its totient is φ = 635121736848.

The previous prime is 635121736763. The next prime is 635121736871. The reversal of 635121736849 is 948637121536.

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., 375852372624 + 259269364225 = 613068^2 + 509185^2 .

It is a cyclic number.

It is not a de Polignac number, because 635121736849 - 2¹⁵ = 635121704081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 635121736849.

It is not a weakly prime, because it can be changed into another prime (635121736889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317560868424 + 317560868425.

It is an arithmetic number, because the mean of its divisors is an integer number (317560868425).

Almost surely, 2^635121736849 is an apocalyptic number.

It is an amenable number.

635121736849 is a deficient number, since it is larger than the sum of its proper divisors (1).

635121736849 is an equidigital number, since it uses as much as digits as its factorization.

635121736849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 55.

The spelling of 635121736849 in words is "six hundred thirty-five billion, one hundred twenty-one million, seven hundred thirty-six thousand, eight hundred forty-nine".