1129999 has 4 divisors (see below), whose sum is σ = 1216936. Its totient is φ = 1043064.

The previous prime is 1129991. The next prime is 1130011. The reversal of 1129999 is 9999211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9999211 = 293 ⋅34127.

It is a cyclic number.

It is not a de Polignac number, because 1129999 - 2³ = 1129991 is a prime.

It is a Duffinian number.

1129999 is a modest number, since divided by 9999 gives 112 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1129991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43449 + ... + 43474.

It is an arithmetic number, because the mean of its divisors is an integer number (304234).

2^1129999 is an apocalyptic number.

1129999 is a deficient number, since it is larger than the sum of its proper divisors (86937).

1129999 is an equidigital number, since it uses as much as digits as its factorization.

1129999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86936.

The product of its digits is 13122, while the sum is 40.

The square root of 1129999 is about 1063.0141109129. The cubic root of 1129999 is about 104.1580130056.

The spelling of 1129999 in words is "one million, one hundred twenty-nine thousand, nine hundred ninety-nine".