1191480209 has 4 divisors (see below), whose sum is σ = 1196010816. Its totient is φ = 1186949604.

The previous prime is 1191480187. The next prime is 1191480211. The reversal of 1191480209 is 9020841911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9020841911 = 59833 ⋅150767.

It is a cyclic number.

It is not a de Polignac number, because 1191480209 - 2¹⁶ = 1191414673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1191480259) 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, 2264909 + ... + 2265434.

It is an arithmetic number, because the mean of its divisors is an integer number (299002704).

Almost surely, 2^1191480209 is an apocalyptic number.

It is an amenable number.

1191480209 is a deficient number, since it is larger than the sum of its proper divisors (4530607).

1191480209 is an equidigital number, since it uses as much as digits as its factorization.

1191480209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4530606.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 1191480209 is about 34517.8245114028. The cubic root of 1191480209 is about 1060.1376968978.

The spelling of 1191480209 in words is "one billion, one hundred ninety-one million, four hundred eighty thousand, two hundred nine".