1268721241 has 2 divisors, whose sum is σ = 1268721242. Its totient is φ = 1268721240.

The previous prime is 1268721197. The next prime is 1268721247. The reversal of 1268721241 is 1421278621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 991998016 + 276723225 = 31496^2 + 16635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1268721241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1268721197 and 1268721206.

It is not a weakly prime, because it can be changed into another prime (1268721247) 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, 634360620 + 634360621.

It is an arithmetic number, because the mean of its divisors is an integer number (634360621).

Almost surely, 2^1268721241 is an apocalyptic number.

It is an amenable number.

1268721241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268721241 is an equidigital number, since it uses as much as digits as its factorization.

1268721241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 34.

The square root of 1268721241 is about 35619.1134224309. The cubic root of 1268721241 is about 1082.5685437879.

Adding to 1268721241 its reverse (1421278621), we get a palindrome (2689999862).

The spelling of 1268721241 in words is "one billion, two hundred sixty-eight million, seven hundred twenty-one thousand, two hundred forty-one".