1331201205 has 24 divisors (see below), whose sum is σ = 2310372792. Its totient is φ = 709064064.

The previous prime is 1331201197. The next prime is 1331201219. The reversal of 1331201205 is 5021021331.

It can be written as a sum of positive squares in 4 ways, for example, as 162792081 + 1168409124 = 12759^2 + 34182^2 .

It is not a de Polignac number, because 1331201205 - 2³ = 1331201197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17307 + ... + 54423.

It is an arithmetic number, because the mean of its divisors is an integer number (96265533).

Almost surely, 2^1331201205 is an apocalyptic number.

1331201205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1331201205 is a deficient number, since it is larger than the sum of its proper divisors (979171587).

1331201205 is a wasteful number, since it uses less digits than its factorization.

1331201205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37925 (or 37922 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1331201205 is about 36485.6301165267. The cubic root of 1331201205 is about 1100.0554255819.

Adding to 1331201205 its reverse (5021021331), we get a palindrome (6352222536).

The spelling of 1331201205 in words is "one billion, three hundred thirty-one million, two hundred one thousand, two hundred five".