1331243205 has 8 divisors (see below), whose sum is σ = 2129989152. Its totient is φ = 709996368.

The previous prime is 1331243201. The next prime is 1331243237. The reversal of 1331243205 is 5023421331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1331243205 - 2² = 1331243201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331243201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44374759 + ... + 44374788.

It is an arithmetic number, because the mean of its divisors is an integer number (266248644).

Almost surely, 2^1331243205 is an apocalyptic number.

1331243205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1331243205 is a deficient number, since it is larger than the sum of its proper divisors (798745947).

1331243205 is an equidigital number, since it uses as much as digits as its factorization.

1331243205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88749555.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 1331243205 is about 36486.2056810516. The cubic root of 1331243205 is about 1100.0669945423.

Adding to 1331243205 its reverse (5023421331), we get a palindrome (6354664536).

The spelling of 1331243205 in words is "one billion, three hundred thirty-one million, two hundred forty-three thousand, two hundred five".