1099591 has 4 divisors (see below), whose sum is σ = 1120392. Its totient is φ = 1078792.

The previous prime is 1099589. The next prime is 1099619. The reversal of 1099591 is 1959901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1959901 = 547 ⋅3583.

It is a cyclic number.

It is not a de Polignac number, because 1099591 - 2¹ = 1099589 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 (1099541) 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, 10321 + ... + 10426.

It is an arithmetic number, because the mean of its divisors is an integer number (280098).

2^1099591 is an apocalyptic number.

1099591 is a deficient number, since it is larger than the sum of its proper divisors (20801).

1099591 is an equidigital number, since it uses as much as digits as its factorization.

1099591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20800.

The product of its (nonzero) digits is 3645, while the sum is 34.

The square root of 1099591 is about 1048.6138469427. The cubic root of 1099591 is about 103.2152159424.

The spelling of 1099591 in words is "one million, ninety-nine thousand, five hundred ninety-one".