1128815997 has 8 divisors (see below), whose sum is σ = 1593622656. Its totient is φ = 708276672.

The previous prime is 1128815957. The next prime is 1128815999. The reversal of 1128815997 is 7995188211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1128815997 - 2¹¹ = 1128813949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 22133647 = 1128815997 / (1 + 1 + 2 + 8 + 8 + 1 + 5 + 9 + 9 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128815999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11066773 + ... + 11066874.

It is an arithmetic number, because the mean of its divisors is an integer number (199202832).

Almost surely, 2^1128815997 is an apocalyptic number.

1128815997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1128815997 is a deficient number, since it is larger than the sum of its proper divisors (464806659).

1128815997 is a wasteful number, since it uses less digits than its factorization.

1128815997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22133667.

The product of its digits is 362880, while the sum is 51.

The square root of 1128815997 is about 33597.8570298762. The cubic root of 1128815997 is about 1041.2165242278.

The spelling of 1128815997 in words is "one billion, one hundred twenty-eight million, eight hundred fifteen thousand, nine hundred ninety-seven".