1080191 has 4 divisors (see below), whose sum is σ = 1234512. Its totient is φ = 925872.

The previous prime is 1080173. The next prime is 1080199. The reversal of 1080191 is 1910801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1910801 = 463 ⋅4127.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1080191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1080199) 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, 77150 + ... + 77163.

It is an arithmetic number, because the mean of its divisors is an integer number (308628).

2^1080191 is an apocalyptic number.

1080191 is a deficient number, since it is larger than the sum of its proper divisors (154321).

1080191 is an equidigital number, since it uses as much as digits as its factorization.

1080191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154320.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1080191 is about 1039.3223753966. The cubic root of 1080191 is about 102.6046046923.

Adding to 1080191 its reverse (1910801), we get a palindrome (2990992).

The spelling of 1080191 in words is "one million, eighty thousand, one hundred ninety-one".