1091000 has 32 divisors (see below), whose sum is σ = 2555280. Its totient is φ = 436000.

The previous prime is 1090997. The next prime is 1091003. The reversal of 1091000 is 1901.

It is an interprime number because it is at equal distance from previous prime (1090997) and next prime (1091003).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455 + ... + 1545.

2^1091000 is an apocalyptic number.

1091000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1277640).

1091000 is an abundant number, since it is smaller than the sum of its proper divisors (1464280).

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

1091000 is a wasteful number, since it uses less digits than its factorization.

1091000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112 (or 1098 counting only the distinct ones).

The product of its (nonzero) digits is 9, while the sum is 11.

The square root of 1091000 is about 1044.5094542416. The cubic root of 1091000 is about 102.9457092842.

Adding to 1091000 its reverse (1901), we get a palindrome (1092901).

The spelling of 1091000 in words is "one million, ninety-one thousand".