1091097 has 32 divisors (see below), whose sum is σ = 1935360. Its totient is φ = 594000.

The previous prime is 1091071. The next prime is 1091119. The reversal of 1091097 is 7901901.

It is not a de Polignac number, because 1091097 - 2⁶ = 1091033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

1091097 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1091097.

It is not an unprimeable number, because it can be changed into a prime (1091017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4222 + ... + 4472.

It is an arithmetic number, because the mean of its divisors is an integer number (60480).

2^1091097 is an apocalyptic number.

It is an amenable number.

1091097 is a deficient number, since it is larger than the sum of its proper divisors (844263).

1091097 is a wasteful number, since it uses less digits than its factorization.

1091097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 27.

The square root of 1091097 is about 1044.5558864896. Note that the first 3 decimals coincide. The cubic root of 1091097 is about 102.9487601360.

Adding to 1091097 its reverse (7901901), we get a palindrome (8992998).

The spelling of 1091097 in words is "one million, ninety-one thousand, ninety-seven".