1331213 has 6 divisors (see below), whose sum is σ = 1441674. Its totient is φ = 1228656.

The previous prime is 1331207. The next prime is 1331227. The reversal of 1331213 is 3121331.

It can be written as a sum of positive squares in 3 ways, for example, as 47524 + 1283689 = 218^2 + 1133^2 .

It is not a de Polignac number, because 1331213 - 2⁸ = 1330957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3770 + ... + 4107.

It is an arithmetic number, because the mean of its divisors is an integer number (240279).

2^1331213 is an apocalyptic number.

1331213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1331213 is a deficient number, since it is larger than the sum of its proper divisors (110461).

1331213 is an equidigital number, since it uses as much as digits as its factorization.

1331213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7903 (or 7890 counting only the distinct ones).

The product of its digits is 54, while the sum is 14.

The square root of 1331213 is about 1153.7820418086. The cubic root of 1331213 is about 110.0058674556.

Adding to 1331213 its reverse (3121331), we get a palindrome (4452544).

It can be divided in two parts, 13312 and 13, that multiplied together give a square (173056 = 416²).

The spelling of 1331213 in words is "one million, three hundred thirty-one thousand, two hundred thirteen".