1138888889 has 2 divisors, whose sum is σ = 1138888890. Its totient is φ = 1138888888.

The previous prime is 1138888873. The next prime is 1138888901. The reversal of 1138888889 is 9888888311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1115025664 + 23863225 = 33392^2 + 4885^2 .

It is a cyclic number.

It is not a de Polignac number, because 1138888889 - 2⁴ = 1138888873 is a prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (1138881889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569444444 + 569444445.

It is an arithmetic number, because the mean of its divisors is an integer number (569444445).

Almost surely, 2^1138888889 is an apocalyptic number.

It is an amenable number.

1138888889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138888889 is an equidigital number, since it uses as much as digits as its factorization.

1138888889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7077888, while the sum is 62.

The square root of 1138888889 is about 33747.4278871739. The cubic root of 1138888889 is about 1044.3044260437.

The spelling of 1138888889 in words is "one billion, one hundred thirty-eight million, eight hundred eighty-eight thousand, eight hundred eighty-nine".