1161500009 has 2 divisors, whose sum is σ = 1161500010. Its totient is φ = 1161500008.

The previous prime is 1161499991. The next prime is 1161500059. The reversal of 1161500009 is 9000051611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1161105625 + 394384 = 34075^2 + 628^2 .

It is an emirp because it is prime and its reverse (9000051611) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161500009 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1161500059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580750004 + 580750005.

It is an arithmetic number, because the mean of its divisors is an integer number (580750005).

Almost surely, 2^1161500009 is an apocalyptic number.

It is an amenable number.

1161500009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161500009 is an equidigital number, since it uses as much as digits as its factorization.

1161500009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 1161500009 is about 34080.7865079432. The cubic root of 1161500009 is about 1051.1702776464.

The spelling of 1161500009 in words is "one billion, one hundred sixty-one million, five hundred thousand, nine".