1155091 has 8 divisors (see below), whose sum is σ = 1362944. Its totient is φ = 957960.

The previous prime is 1155071. The next prime is 1155097. The reversal of 1155091 is 1905511.

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

It is a cyclic number.

It is not a de Polignac number, because 1155091 - 2⁹ = 1154579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2445 + ... + 2878.

It is an arithmetic number, because the mean of its divisors is an integer number (170368).

2^1155091 is an apocalyptic number.

1155091 is a deficient number, since it is larger than the sum of its proper divisors (207853).

1155091 is an equidigital number, since it uses as much as digits as its factorization.

1155091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5361.

The product of its (nonzero) digits is 225, while the sum is 22.

The square root of 1155091 is about 1074.7515992079. The cubic root of 1155091 is about 104.9233302737.

The spelling of 1155091 in words is "one million, one hundred fifty-five thousand, ninety-one".