1111678889 has 2 divisors, whose sum is σ = 1111678890. Its totient is φ = 1111678888.

The previous prime is 1111678877. The next prime is 1111678891. The reversal of 1111678889 is 9888761111.

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., 609694864 + 501984025 = 24692^2 + 22405^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111678889 - 2⁴ = 1111678873 is a prime.

It is a Sophie Germain prime.

Together with 1111678891, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (1111678859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555839444 + 555839445.

It is an arithmetic number, because the mean of its divisors is an integer number (555839445).

Almost surely, 2^1111678889 is an apocalyptic number.

It is an amenable number.

1111678889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111678889 is an equidigital number, since it uses as much as digits as its factorization.

1111678889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 50.

The square root of 1111678889 is about 33341.8489139400. The cubic root of 1111678889 is about 1035.9205604005.

The spelling of 1111678889 in words is "one billion, one hundred eleven million, six hundred seventy-eight thousand, eight hundred eighty-nine".