1100321243 has 16 divisors (see below), whose sum is σ = 1348346880. Its totient is φ = 876410496.

The previous prime is 1100321221. The next prime is 1100321249. The reversal of 1100321243 is 3421230011.

It is a cyclic number.

It is not a de Polignac number, because 1100321243 - 2¹⁴ = 1100304859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1100321249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49121 + ... + 67922.

It is an arithmetic number, because the mean of its divisors is an integer number (84271680).

Almost surely, 2^1100321243 is an apocalyptic number.

1100321243 is a deficient number, since it is larger than the sum of its proper divisors (248025637).

1100321243 is a wasteful number, since it uses less digits than its factorization.

1100321243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117146.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1100321243 is about 33171.0904704684. The cubic root of 1100321243 is about 1032.3805943912.

Adding to 1100321243 its reverse (3421230011), we get a palindrome (4521551254).

The spelling of 1100321243 in words is "one billion, one hundred million, three hundred twenty-one thousand, two hundred forty-three".