1331243201 has 2 divisors, whose sum is σ = 1331243202. Its totient is φ = 1331243200.

The previous prime is 1331243183. The next prime is 1331243237. The reversal of 1331243201 is 1023421331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1247502400 + 83740801 = 35320^2 + 9151^2 .

It is an emirp because it is prime and its reverse (1023421331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1331243201 - 2¹⁰ = 1331242177 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 (1331243281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665621600 + 665621601.

It is an arithmetic number, because the mean of its divisors is an integer number (665621601).

Almost surely, 2^1331243201 is an apocalyptic number.

It is an amenable number.

1331243201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331243201 is an equidigital number, since it uses as much as digits as its factorization.

1331243201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1331243201 is about 36486.2056262363. The cubic root of 1331243201 is about 1100.0669934405.

Adding to 1331243201 its reverse (1023421331), we get a palindrome (2354664532).

The spelling of 1331243201 in words is "one billion, three hundred thirty-one million, two hundred forty-three thousand, two hundred one".