1159891 has 4 divisors (see below), whose sum is σ = 1169152. Its totient is φ = 1150632.

The previous prime is 1159889. The next prime is 1159901. The reversal of 1159891 is 1989511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1989511 = 463 ⋅4297.

It is a cyclic number.

It is not a de Polignac number, because 1159891 - 2¹ = 1159889 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1159811) 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, 4440 + ... + 4693.

It is an arithmetic number, because the mean of its divisors is an integer number (292288).

2^1159891 is an apocalyptic number.

1159891 is a deficient number, since it is larger than the sum of its proper divisors (9261).

1159891 is an equidigital number, since it uses as much as digits as its factorization.

1159891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9260.

The product of its digits is 3240, while the sum is 34.

The square root of 1159891 is about 1076.9823582585. The cubic root of 1159891 is about 105.0684663061.

The spelling of 1159891 in words is "one million, one hundred fifty-nine thousand, eight hundred ninety-one".