1111788889 has 2 divisors, whose sum is σ = 1111788890. Its totient is φ = 1111788888.

The previous prime is 1111788827. The next prime is 1111788893. The reversal of 1111788889 is 9888871111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1111555600 + 233289 = 33340^2 + 483^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111788889 is a prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (1111788289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555894444 + 555894445.

It is an arithmetic number, because the mean of its divisors is an integer number (555894445).

Almost surely, 2^1111788889 is an apocalyptic number.

It is an amenable number.

1111788889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111788889 is an equidigital number, since it uses as much as digits as its factorization.

1111788889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 52.

The square root of 1111788889 is about 33343.4984517222. The cubic root of 1111788889 is about 1035.9547271923.

The spelling of 1111788889 in words is "one billion, one hundred eleven million, seven hundred eighty-eight thousand, eight hundred eighty-nine".