1337944721 has 2 divisors, whose sum is σ = 1337944722. Its totient is φ = 1337944720.

The previous prime is 1337944669. The next prime is 1337944757. The reversal of 1337944721 is 1274497331.

1337944721 = 25864² + 25865².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 668998225 + 668946496 = 25865^2 + 25864^2 .

It is a cyclic number.

It is not a de Polignac number, because 1337944721 - 2¹⁰ = 1337943697 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 (1337904721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 668972360 + 668972361.

It is an arithmetic number, because the mean of its divisors is an integer number (668972361).

Almost surely, 2^1337944721 is an apocalyptic number.

1337944721 is the 25865-th centered square number.

It is an amenable number.

1337944721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1337944721 is an equidigital number, since it uses as much as digits as its factorization.

1337944721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 41.

The square root of 1337944721 is about 36577.9266908336. The cubic root of 1337944721 is about 1101.9098285030.

The spelling of 1337944721 in words is "one billion, three hundred thirty-seven million, nine hundred forty-four thousand, seven hundred twenty-one".