1091653 has 4 divisors (see below), whose sum is σ = 1094668. Its totient is φ = 1088640.

The previous prime is 1091639. The next prime is 1091659. The reversal of 1091653 is 3561901.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 232324 + 859329 = 482^2 + 927^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091653 - 2¹⁷ = 960581 is a prime.

It is an Ulam number.

It is a Duffinian number.

1091653 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091659) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 876 + ... + 1717.

It is an arithmetic number, because the mean of its divisors is an integer number (273667).

2^1091653 is an apocalyptic number.

It is an amenable number.

1091653 is a deficient number, since it is larger than the sum of its proper divisors (3015).

1091653 is an equidigital number, since it uses as much as digits as its factorization.

1091653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 1091653 is about 1044.8219944086. The cubic root of 1091653 is about 102.9662440049.

The spelling of 1091653 in words is "one million, ninety-one thousand, six hundred fifty-three".