633987889 has 2 divisors, whose sum is σ = 633987890. Its totient is φ = 633987888.

The previous prime is 633987883. The next prime is 633987911. The reversal of 633987889 is 988789336.

633987889 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., 616280625 + 17707264 = 24825^2 + 4208^2 .

It is a cyclic number.

It is not a de Polignac number, because 633987889 - 2³ = 633987881 is a prime.

It is not a weakly prime, because it can be changed into another prime (633987881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316993944 + 316993945.

It is an arithmetic number, because the mean of its divisors is an integer number (316993945).

Almost surely, 2^633987889 is an apocalyptic number.

It is an amenable number.

633987889 is a deficient number, since it is larger than the sum of its proper divisors (1).

633987889 is an equidigital number, since it uses as much as digits as its factorization.

633987889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15676416, while the sum is 61.

The square root of 633987889 is about 25179.1161282520. The cubic root of 633987889 is about 859.0669025968.

The spelling of 633987889 in words is "six hundred thirty-three million, nine hundred eighty-seven thousand, eight hundred eighty-nine".