1091197 has 4 divisors (see below), whose sum is σ = 1093756. Its totient is φ = 1088640.

The previous prime is 1091191. The next prime is 1091219. The reversal of 1091197 is 7911901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7911901 = 107 ⋅73943.

It can be written as a sum of positive squares in 2 ways, for example, as 695556 + 395641 = 834^2 + 629^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1091197 is a prime.

It is a Duffinian number.

1091197 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091191) 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, 468 + ... + 1549.

It is an arithmetic number, because the mean of its divisors is an integer number (273439).

2^1091197 is an apocalyptic number.

It is an amenable number.

1091197 is a deficient number, since it is larger than the sum of its proper divisors (2559).

1091197 is an equidigital number, since it uses as much as digits as its factorization.

1091197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2558.

The product of its (nonzero) digits is 567, while the sum is 28.

The square root of 1091197 is about 1044.6037526258. The cubic root of 1091197 is about 102.9519051547.

The spelling of 1091197 in words is "one million, ninety-one thousand, one hundred ninety-seven".