1296191249 has 2 divisors, whose sum is σ = 1296191250. Its totient is φ = 1296191248.

The previous prime is 1296191227. The next prime is 1296191297. The reversal of 1296191249 is 9421916921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1266292225 + 29899024 = 35585^2 + 5468^2 .

It is a cyclic number.

It is not a de Polignac number, because 1296191249 - 2¹² = 1296187153 is a prime.

It is a super-2 number, since 2×1296191249² = 3360223507968360002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1296121249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648095624 + 648095625.

It is an arithmetic number, because the mean of its divisors is an integer number (648095625).

Almost surely, 2^1296191249 is an apocalyptic number.

It is an amenable number.

1296191249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1296191249 is an equidigital number, since it uses as much as digits as its factorization.

1296191249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 44.

The square root of 1296191249 is about 36002.6561381240. The cubic root of 1296191249 is about 1090.3259830763.

The spelling of 1296191249 in words is "one billion, two hundred ninety-six million, one hundred ninety-one thousand, two hundred forty-nine".