1128219191 has 4 divisors (see below), whose sum is σ = 1230784584. Its totient is φ = 1025653800.

The previous prime is 1128219179. The next prime is 1128219193. The reversal of 1128219191 is 1919128211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1128219191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128219193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51282680 + ... + 51282701.

It is an arithmetic number, because the mean of its divisors is an integer number (307696146).

Almost surely, 2^1128219191 is an apocalyptic number.

1128219191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1128219191 is a deficient number, since it is larger than the sum of its proper divisors (102565393).

1128219191 is a wasteful number, since it uses less digits than its factorization.

1128219191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102565392.

The product of its digits is 2592, while the sum is 35.

The square root of 1128219191 is about 33588.9742475116. The cubic root of 1128219191 is about 1041.0329945190.

The spelling of 1128219191 in words is "one billion, one hundred twenty-eight million, two hundred nineteen thousand, one hundred ninety-one".