1155728099 has 4 divisors (see below), whose sum is σ = 1158224736. Its totient is φ = 1153231464.

The previous prime is 1155728087. The next prime is 1155728107. The reversal of 1155728099 is 9908275511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9908275511 = 79 ⋅125421209.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155728099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155728059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1247624 + ... + 1248549.

It is an arithmetic number, because the mean of its divisors is an integer number (289556184).

Almost surely, 2^1155728099 is an apocalyptic number.

1155728099 is a deficient number, since it is larger than the sum of its proper divisors (2496637).

1155728099 is an equidigital number, since it uses as much as digits as its factorization.

1155728099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496636.

The product of its (nonzero) digits is 226800, while the sum is 47.

The square root of 1155728099 is about 33996.0012207318. The cubic root of 1155728099 is about 1049.4261714163.

The spelling of 1155728099 in words is "one billion, one hundred fifty-five million, seven hundred twenty-eight thousand, ninety-nine".