1291163249 has 2 divisors, whose sum is σ = 1291163250. Its totient is φ = 1291163248.

The previous prime is 1291163239. The next prime is 1291163309. The reversal of 1291163249 is 9423611921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1192459024 + 98704225 = 34532^2 + 9935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291163249 - 2²⁸ = 1022727793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291163239) 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, 645581624 + 645581625.

It is an arithmetic number, because the mean of its divisors is an integer number (645581625).

Almost surely, 2^1291163249 is an apocalyptic number.

It is an amenable number.

1291163249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291163249 is an equidigital number, since it uses as much as digits as its factorization.

1291163249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 1291163249 is about 35932.7601082912. The cubic root of 1291163249 is about 1088.9143439377.

The spelling of 1291163249 in words is "one billion, two hundred ninety-one million, one hundred sixty-three thousand, two hundred forty-nine".