1128138111 has 20 divisors (see below), whose sum is σ = 1692265344. Its totient is φ = 748958400.

The previous prime is 1128138107. The next prime is 1128138157. The reversal of 1128138111 is 1118318211.

1128138111 is a `hidden beast` number, since 1 + 1 + 281 + 381 + 1 + 1 = 666.

It is not a de Polignac number, because 1128138111 - 2² = 1128138107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128138181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9375 + ... + 48416.

Almost surely, 2^1128138111 is an apocalyptic number.

1128138111 is a deficient number, since it is larger than the sum of its proper divisors (564127233).

1128138111 is an equidigital number, since it uses as much as digits as its factorization.

1128138111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58044 (or 58035 counting only the distinct ones).

The product of its digits is 384, while the sum is 27.

The square root of 1128138111 is about 33587.7672821520. The cubic root of 1128138111 is about 1041.0080558139.

The spelling of 1128138111 in words is "one billion, one hundred twenty-eight million, one hundred thirty-eight thousand, one hundred eleven".