111128789 has 2 divisors, whose sum is σ = 111128790. Its totient is φ = 111128788.

The previous prime is 111128767. The next prime is 111128791. The reversal of 111128789 is 987821111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88642225 + 22486564 = 9415^2 + 4742^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111128789 is a prime.

Together with 111128791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111128089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55564394 + 55564395.

It is an arithmetic number, because the mean of its divisors is an integer number (55564395).

Almost surely, 2^111128789 is an apocalyptic number.

It is an amenable number.

111128789 is a deficient number, since it is larger than the sum of its proper divisors (1).

111128789 is an equidigital number, since it uses as much as digits as its factorization.

111128789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 38.

The square root of 111128789 is about 10541.7640364410. The cubic root of 111128789 is about 480.7753513448.

The spelling of 111128789 in words is "one hundred eleven million, one hundred twenty-eight thousand, seven hundred eighty-nine".