1131158909 has 2 divisors, whose sum is σ = 1131158910. Its totient is φ = 1131158908.

The previous prime is 1131158867. The next prime is 1131158981. The reversal of 1131158909 is 9098511311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1044259225 + 86899684 = 32315^2 + 9322^2 .

It is an emirp because it is prime and its reverse (9098511311) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131158909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131152909) 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, 565579454 + 565579455.

It is an arithmetic number, because the mean of its divisors is an integer number (565579455).

Almost surely, 2^1131158909 is an apocalyptic number.

It is an amenable number.

1131158909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131158909 is an equidigital number, since it uses as much as digits as its factorization.

1131158909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 38.

The square root of 1131158909 is about 33632.7059422818. The cubic root of 1131158909 is about 1041.9363914418.

The spelling of 1131158909 in words is "one billion, one hundred thirty-one million, one hundred fifty-eight thousand, nine hundred nine".