1099950209 has 2 divisors, whose sum is σ = 1099950210. Its totient is φ = 1099950208.

The previous prime is 1099950179. The next prime is 1099950211. The reversal of 1099950209 is 9020599901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 972192400 + 127757809 = 31180^2 + 11303^2 .

It is a cyclic number.

It is not a de Polignac number, because 1099950209 - 2²⁰ = 1098901633 is a prime.

Together with 1099950211, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1099950209.

It is not a weakly prime, because it can be changed into another prime (1099950239) 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, 549975104 + 549975105.

It is an arithmetic number, because the mean of its divisors is an integer number (549975105).

Almost surely, 2^1099950209 is an apocalyptic number.

It is an amenable number.

1099950209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1099950209 is an equidigital number, since it uses as much as digits as its factorization.

1099950209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65610, while the sum is 44.

The square root of 1099950209 is about 33165.4972674917. The cubic root of 1099950209 is about 1032.2645399913.

The spelling of 1099950209 in words is "one billion, ninety-nine million, nine hundred fifty thousand, two hundred nine".