1099540243 has 2 divisors, whose sum is σ = 1099540244. Its totient is φ = 1099540242.

The previous prime is 1099540207. The next prime is 1099540303. The reversal of 1099540243 is 3420459901.

It is a weak prime.

It is an emirp because it is prime and its reverse (3420459901) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1099540243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1099580243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549770121 + 549770122.

It is an arithmetic number, because the mean of its divisors is an integer number (549770122).

Almost surely, 2^1099540243 is an apocalyptic number.

1099540243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1099540243 is an equidigital number, since it uses as much as digits as its factorization.

1099540243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1099540243 is about 33159.3160816082. The cubic root of 1099540243 is about 1032.1362778365.

The spelling of 1099540243 in words is "one billion, ninety-nine million, five hundred forty thousand, two hundred forty-three".