1153891 has 2 divisors, whose sum is σ = 1153892. Its totient is φ = 1153890.

The previous prime is 1153871. The next prime is 1153921. The reversal of 1153891 is 1983511.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1153891 is a prime.

It is not a weakly prime, because it can be changed into another prime (1153811) 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 as a sum of consecutive naturals, namely, 576945 + 576946.

It is an arithmetic number, because the mean of its divisors is an integer number (576946).

2^1153891 is an apocalyptic number.

1153891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1153891 is an equidigital number, since it uses as much as digits as its factorization.

1153891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 28.

The square root of 1153891 is about 1074.1931856049. The cubic root of 1153891 is about 104.8869834628.

The spelling of 1153891 in words is "one million, one hundred fifty-three thousand, eight hundred ninety-one".