1128391559 has 4 divisors (see below), whose sum is σ = 1128502320. Its totient is φ = 1128280800.

The previous prime is 1128391549. The next prime is 1128391577. The reversal of 1128391559 is 9551938211.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1128391559 - 2⁴ = 1128391543 is a prime.

It is a super-3 number, since 3×1128391559³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128391549) 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, 38354 + ... + 61055.

It is an arithmetic number, because the mean of its divisors is an integer number (282125580).

Almost surely, 2^1128391559 is an apocalyptic number.

1128391559 is a deficient number, since it is larger than the sum of its proper divisors (110761).

1128391559 is an equidigital number, since it uses as much as digits as its factorization.

1128391559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110760.

The product of its digits is 97200, while the sum is 44.

The square root of 1128391559 is about 33591.5399914919. The cubic root of 1128391559 is about 1041.0860077512.

The spelling of 1128391559 in words is "one billion, one hundred twenty-eight million, three hundred ninety-one thousand, five hundred fifty-nine".