635489969 has 2 divisors, whose sum is σ = 635489970. Its totient is φ = 635489968.

The previous prime is 635489957. The next prime is 635490019. The reversal of 635489969 is 969984536.

635489969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 433139344 + 202350625 = 20812^2 + 14225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-635489969 is a prime.

It is a super-2 number, since 2×635489969² = 807695001399241922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (635489909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317744984 + 317744985.

It is an arithmetic number, because the mean of its divisors is an integer number (317744985).

Almost surely, 2^635489969 is an apocalyptic number.

It is an amenable number.

635489969 is a deficient number, since it is larger than the sum of its proper divisors (1).

635489969 is an equidigital number, since it uses as much as digits as its factorization.

635489969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12597120, while the sum is 59.

The square root of 635489969 is about 25208.9263753933. The cubic root of 635489969 is about 859.7448174742.

The spelling of 635489969 in words is "six hundred thirty-five million, four hundred eighty-nine thousand, nine hundred sixty-nine".