1090591 has 4 divisors (see below), whose sum is σ = 1138032. Its totient is φ = 1043152.

The previous prime is 1090589. The next prime is 1090597. The reversal of 1090591 is 1950901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1950901 = 19 ⋅102679.

It is a cyclic number.

It is not a de Polignac number, because 1090591 - 2¹ = 1090589 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 (1090597) 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, 23686 + ... + 23731.

It is an arithmetic number, because the mean of its divisors is an integer number (284508).

2^1090591 is an apocalyptic number.

1090591 is a deficient number, since it is larger than the sum of its proper divisors (47441).

1090591 is an equidigital number, since it uses as much as digits as its factorization.

1090591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47440.

The product of its (nonzero) digits is 405, while the sum is 25.

The square root of 1090591 is about 1044.3136502028. The cubic root of 1090591 is about 102.9328433943.

It can be divided in two parts, 1090 and 591, that added together give a square (1681 = 41²).

The spelling of 1090591 in words is "one million, ninety thousand, five hundred ninety-one".