1091841 has 4 divisors (see below), whose sum is σ = 1455792. Its totient is φ = 727892.

The previous prime is 1091837. The next prime is 1091843. The reversal of 1091841 is 1481901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1481901 = 3 ⋅493967.

It is a cyclic number.

It is not a de Polignac number, because 1091841 - 2² = 1091837 is a prime.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1091843) 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, 181971 + ... + 181976.

It is an arithmetic number, because the mean of its divisors is an integer number (363948).

2^1091841 is an apocalyptic number.

It is an amenable number.

1091841 is a deficient number, since it is larger than the sum of its proper divisors (363951).

1091841 is an equidigital number, since it uses as much as digits as its factorization.

1091841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363950.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 1091841 is about 1044.9119580137. The cubic root of 1091841 is about 102.9721544736.

The spelling of 1091841 in words is "one million, ninety-one thousand, eight hundred forty-one".