1001099 has 4 divisors (see below), whose sum is σ = 1092120. Its totient is φ = 910080.

The previous prime is 1001093. The next prime is 1001107. The reversal of 1001099 is 9901001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9901001 = 11 ⋅900091.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001099 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1001099.

It is not an unprimeable number, because it can be changed into a prime (1001093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45494 + ... + 45515.

It is an arithmetic number, because the mean of its divisors is an integer number (273030).

2^1001099 is an apocalyptic number.

1001099 is a deficient number, since it is larger than the sum of its proper divisors (91021).

1001099 is an equidigital number, since it uses as much as digits as its factorization.

1001099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91020.

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

The square root of 1001099 is about 1000.5493491078. The cubic root of 1001099 is about 100.0366199215.

The spelling of 1001099 in words is "one million, one thousand, ninety-nine".