1291162049 has 4 divisors (see below), whose sum is σ = 1291326036. Its totient is φ = 1290998064.

The previous prime is 1291162039. The next prime is 1291162057. The reversal of 1291162049 is 9402611921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 435014449 + 856147600 = 20857^2 + 29260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291162049 - 2¹² = 1291157953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1291162009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69554 + ... + 86139.

It is an arithmetic number, because the mean of its divisors is an integer number (322831509).

Almost surely, 2^1291162049 is an apocalyptic number.

It is an amenable number.

1291162049 is a deficient number, since it is larger than the sum of its proper divisors (163987).

1291162049 is an equidigital number, since it uses as much as digits as its factorization.

1291162049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163986.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 1291162049 is about 35932.7434104328. The cubic root of 1291162049 is about 1088.9140065939.

The spelling of 1291162049 in words is "one billion, two hundred ninety-one million, one hundred sixty-two thousand, forty-nine".