1129558999 has 4 divisors (see below), whose sum is σ = 1196003664. Its totient is φ = 1063114336.

The previous prime is 1129558993. The next prime is 1129559027. The reversal of 1129558999 is 9998559211.

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

It is a cyclic number.

It is not a de Polignac number, because 1129558999 - 2²⁷ = 995341271 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 (1129558993) 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, 33222307 + ... + 33222340.

It is an arithmetic number, because the mean of its divisors is an integer number (299000916).

Almost surely, 2^1129558999 is an apocalyptic number.

1129558999 is a deficient number, since it is larger than the sum of its proper divisors (66444665).

1129558999 is an equidigital number, since it uses as much as digits as its factorization.

1129558999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66444664.

The product of its digits is 2624400, while the sum is 58.

The square root of 1129558999 is about 33608.9124935634. The cubic root of 1129558999 is about 1041.4449217366. Note that the first 3 decimals are identical.

The spelling of 1129558999 in words is "one billion, one hundred twenty-nine million, five hundred fifty-eight thousand, nine hundred ninety-nine".