1331201213 has 4 divisors (see below), whose sum is σ = 1346158620. Its totient is φ = 1316243808.

The previous prime is 1331201197. The next prime is 1331201219. The reversal of 1331201213 is 3121021331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 115842169 + 1215359044 = 10763^2 + 34862^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331201213 - 2⁴ = 1331201197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331201191 and 1331201200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331201219) 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, 7478570 + ... + 7478747.

It is an arithmetic number, because the mean of its divisors is an integer number (336539655).

Almost surely, 2^1331201213 is an apocalyptic number.

It is an amenable number.

1331201213 is a deficient number, since it is larger than the sum of its proper divisors (14957407).

1331201213 is an equidigital number, since it uses as much as digits as its factorization.

1331201213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14957406.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1331201213 is about 36485.6302261589. The cubic root of 1331201213 is about 1100.0554277855.

Adding to 1331201213 its reverse (3121021331), we get a palindrome (4452222544).

The spelling of 1331201213 in words is "one billion, three hundred thirty-one million, two hundred one thousand, two hundred thirteen".