1155089 has 4 divisors (see below), whose sum is σ = 1243956. Its totient is φ = 1066224.

The previous prime is 1155071. The next prime is 1155097. The reversal of 1155089 is 9805511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9805511 = 421 ⋅23291.

It can be written as a sum of positive squares in 2 ways, for example, as 774400 + 380689 = 880^2 + 617^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155019) 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, 44414 + ... + 44439.

It is an arithmetic number, because the mean of its divisors is an integer number (310989).

2^1155089 is an apocalyptic number.

It is an amenable number.

1155089 is a deficient number, since it is larger than the sum of its proper divisors (88867).

1155089 is an equidigital number, since it uses as much as digits as its factorization.

1155089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88866.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 1155089 is about 1074.7506687600. The cubic root of 1155089 is about 104.9232697166.

The spelling of 1155089 in words is "one million, one hundred fifty-five thousand, eighty-nine".