1272424649 has 2 divisors, whose sum is σ = 1272424650. Its totient is φ = 1272424648.

The previous prime is 1272424631. The next prime is 1272424669. The reversal of 1272424649 is 9464242721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 835614649 + 436810000 = 28907^2 + 20900^2 .

It is an emirp because it is prime and its reverse (9464242721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1272424649 - 2⁸ = 1272424393 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 (1272424609) 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, 636212324 + 636212325.

It is an arithmetic number, because the mean of its divisors is an integer number (636212325).

Almost surely, 2^1272424649 is an apocalyptic number.

It is an amenable number.

1272424649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272424649 is an equidigital number, since it uses as much as digits as its factorization.

1272424649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 41.

The square root of 1272424649 is about 35671.0617868322. The cubic root of 1272424649 is about 1083.6208627775.

It can be divided in two parts, 12724 and 24649, that added together give a palindrome (37373).

The spelling of 1272424649 in words is "one billion, two hundred seventy-two million, four hundred twenty-four thousand, six hundred forty-nine".