1091149 has 2 divisors, whose sum is σ = 1091150. Its totient is φ = 1091148.

The previous prime is 1091147. The next prime is 1091159. The reversal of 1091149 is 9411901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 990025 + 101124 = 995^2 + 318^2 .

It is an emirp because it is prime and its reverse (9411901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1091149 - 2¹ = 1091147 is a prime.

It is a super-2 number, since 2×1091149² = 2381212280402, which contains 22 as substring.

Together with 1091147, it forms a pair of twin primes.

1091149 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545574 + 545575.

It is an arithmetic number, because the mean of its divisors is an integer number (545575).

2^1091149 is an apocalyptic number.

It is an amenable number.

1091149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091149 is an equidigital number, since it uses as much as digits as its factorization.

1091149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 1091149 is about 1044.5807771542. The cubic root of 1091149 is about 102.9503955697.

The spelling of 1091149 in words is "one million, ninety-one thousand, one hundred forty-nine".