1161495509 has 2 divisors, whose sum is σ = 1161495510. Its totient is φ = 1161495508.

The previous prime is 1161495497. The next prime is 1161495523. The reversal of 1161495509 is 9055941611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 748186609 + 413308900 = 27353^2 + 20330^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161495509 - 2²⁴ = 1144718293 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 (1161495409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580747754 + 580747755.

It is an arithmetic number, because the mean of its divisors is an integer number (580747755).

Almost surely, 2^1161495509 is an apocalyptic number.

It is an amenable number.

1161495509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161495509 is an equidigital number, since it uses as much as digits as its factorization.

1161495509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 41.

The square root of 1161495509 is about 34080.7204882761. The cubic root of 1161495509 is about 1051.1689201282.

The spelling of 1161495509 in words is "one billion, one hundred sixty-one million, four hundred ninety-five thousand, five hundred nine".