1091090 has 64 divisors (see below), whose sum is σ = 2661120. Its totient is φ = 311040.

The previous prime is 1091071. The next prime is 1091119. The reversal of 1091090 is 901901.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9956 + ... + 10064.

It is an arithmetic number, because the mean of its divisors is an integer number (41580).

2^1091090 is an apocalyptic number.

1091090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1091090 is an abundant number, since it is smaller than the sum of its proper divisors (1570030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1091090 is a wasteful number, since it uses less digits than its factorization.

1091090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 1091090 is about 1044.5525357779. The cubic root of 1091090 is about 102.9485399775.

Adding to 1091090 its reverse (901901), we get a palindrome (1992991).

The spelling of 1091090 in words is "one million, ninety-one thousand, ninety".