1331215241 has 2 divisors, whose sum is σ = 1331215242. Its totient is φ = 1331215240.

The previous prime is 1331215219. The next prime is 1331215271. The reversal of 1331215241 is 1425121331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1184805241 + 146410000 = 34421^2 + 12100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331215241 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1331215201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665607620 + 665607621.

It is an arithmetic number, because the mean of its divisors is an integer number (665607621).

Almost surely, 2^1331215241 is an apocalyptic number.

It is an amenable number.

1331215241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331215241 is an equidigital number, since it uses as much as digits as its factorization.

1331215241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 1331215241 is about 36485.8224657195. The cubic root of 1331215241 is about 1100.0592918453.

Adding to 1331215241 its reverse (1425121331), we get a palindrome (2756336572).

The spelling of 1331215241 in words is "one billion, three hundred thirty-one million, two hundred fifteen thousand, two hundred forty-one".