1090191 has 4 divisors (see below), whose sum is σ = 1453592. Its totient is φ = 726792.

The previous prime is 1090189. The next prime is 1090211. The reversal of 1090191 is 1910901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1910901 = 3 ⋅636967.

It is not a de Polignac number, because 1090191 - 2¹ = 1090189 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1090151) 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, 181696 + ... + 181701.

It is an arithmetic number, because the mean of its divisors is an integer number (363398).

2^1090191 is an apocalyptic number.

1090191 is a deficient number, since it is larger than the sum of its proper divisors (363401).

1090191 is an equidigital number, since it uses as much as digits as its factorization.

1090191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363400.

The product of its (nonzero) digits is 81, while the sum is 21.

The square root of 1090191 is about 1044.1221192945. The cubic root of 1090191 is about 102.9202575052.

The spelling of 1090191 in words is "one million, ninety thousand, one hundred ninety-one".