1205319449 has 4 divisors (see below), whose sum is σ = 1205393664. Its totient is φ = 1205245236.

The previous prime is 1205319419. The next prime is 1205319461. The reversal of 1205319449 is 9449135021.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9449135021 = 1889 ⋅5002189.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1205319449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205319419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1097 + ... + 49110.

It is an arithmetic number, because the mean of its divisors is an integer number (301348416).

Almost surely, 2^1205319449 is an apocalyptic number.

It is an amenable number.

1205319449 is a deficient number, since it is larger than the sum of its proper divisors (74215).

1205319449 is an equidigital number, since it uses as much as digits as its factorization.

1205319449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74214.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1205319449 is about 34717.7108836398. The cubic root of 1205319449 is about 1064.2264652709.

The spelling of 1205319449 in words is "one billion, two hundred five million, three hundred nineteen thousand, four hundred forty-nine".