1161909218 has 6 divisors (see below), whose sum is σ = 1742936139. Its totient is φ = 580930506.

The previous prime is 1161909211. The next prime is 1161909263. The reversal of 1161909218 is 8129091611.

It can be written as a sum of positive squares in only one way, i.e., 580954609 + 580954609 = 24103^2 + 24103^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=24103.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161909211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 36155 + ... + 60257.

Almost surely, 2^1161909218 is an apocalyptic number.

1161909218 is a deficient number, since it is larger than the sum of its proper divisors (581026921).

1161909218 is an frugal number, since it uses more digits than its factorization.

1161909218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48208 (or 24105 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 38.

The square root of 1161909218 is about 34086.7894938787. The cubic root of 1161909218 is about 1051.2937093667.

The spelling of 1161909218 in words is "one billion, one hundred sixty-one million, nine hundred nine thousand, two hundred eighteen".