1291360849 has 2 divisors, whose sum is σ = 1291360850. Its totient is φ = 1291360848.

The previous prime is 1291360801. The next prime is 1291360853. The reversal of 1291360849 is 9480631921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 679540624 + 611820225 = 26068^2 + 24735^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291360849 - 2¹¹ = 1291358801 is a prime.

It is a super-2 number, since 2×1291360849² = 3335225684660001602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1291360549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645680424 + 645680425.

It is an arithmetic number, because the mean of its divisors is an integer number (645680425).

Almost surely, 2^1291360849 is an apocalyptic number.

It is an amenable number.

1291360849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291360849 is an equidigital number, since it uses as much as digits as its factorization.

1291360849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 1291360849 is about 35935.5095831407. The cubic root of 1291360849 is about 1088.9698903604.

The spelling of 1291360849 in words is "one billion, two hundred ninety-one million, three hundred sixty thousand, eight hundred forty-nine".