635159489 has 2 divisors, whose sum is σ = 635159490. Its totient is φ = 635159488.

The previous prime is 635159477. The next prime is 635159519. The reversal of 635159489 is 984951536.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 598047025 + 37112464 = 24455^2 + 6092^2 .

It is a cyclic number.

It is not a de Polignac number, because 635159489 - 2²⁴ = 618382273 is a prime.

It is a super-2 number, since 2×635159489² = 806855152933482242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (635159419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317579744 + 317579745.

It is an arithmetic number, because the mean of its divisors is an integer number (317579745).

Almost surely, 2^635159489 is an apocalyptic number.

It is an amenable number.

635159489 is a deficient number, since it is larger than the sum of its proper divisors (1).

635159489 is an equidigital number, since it uses as much as digits as its factorization.

635159489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166400, while the sum is 50.

The square root of 635159489 is about 25202.3707019796. The cubic root of 635159489 is about 859.5957578258.

The spelling of 635159489 in words is "six hundred thirty-five million, one hundred fifty-nine thousand, four hundred eighty-nine".