1338127261 has 2 divisors, whose sum is σ = 1338127262. Its totient is φ = 1338127260.

The previous prime is 1338127249. The next prime is 1338127381. The reversal of 1338127261 is 1627218331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1058200900 + 279926361 = 32530^2 + 16731^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338127261 - 2⁵ = 1338127229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1338127211) 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, 669063630 + 669063631.

It is an arithmetic number, because the mean of its divisors is an integer number (669063631).

Almost surely, 2^1338127261 is an apocalyptic number.

It is an amenable number.

1338127261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338127261 is an equidigital number, since it uses as much as digits as its factorization.

1338127261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 1338127261 is about 36580.4218264361. The cubic root of 1338127261 is about 1101.9599385636.

The spelling of 1338127261 in words is "one billion, three hundred thirty-eight million, one hundred twenty-seven thousand, two hundred sixty-one".