1128198823 has 2 divisors, whose sum is σ = 1128198824. Its totient is φ = 1128198822.

The previous prime is 1128198809. The next prime is 1128198833. The reversal of 1128198823 is 3288918211.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1128198823 - 2⁹ = 1128198311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1128198823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1128198833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564099411 + 564099412.

It is an arithmetic number, because the mean of its divisors is an integer number (564099412).

Almost surely, 2^1128198823 is an apocalyptic number.

1128198823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128198823 is an equidigital number, since it uses as much as digits as its factorization.

1128198823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 43.

The square root of 1128198823 is about 33588.6710514126. The cubic root of 1128198823 is about 1041.0267298121.

The spelling of 1128198823 in words is "one billion, one hundred twenty-eight million, one hundred ninety-eight thousand, eight hundred twenty-three".