1161166217 has 4 divisors (see below), whose sum is σ = 1161244416. Its totient is φ = 1161088020.

The previous prime is 1161166199. The next prime is 1161166229. The reversal of 1161166217 is 7126611611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1161166217 - 2¹⁰ = 1161165193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161163217) 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 in 3 ways as a sum of consecutive naturals, for example, 9209 + ... + 49062.

It is an arithmetic number, because the mean of its divisors is an integer number (290311104).

Almost surely, 2^1161166217 is an apocalyptic number.

It is an amenable number.

1161166217 is a deficient number, since it is larger than the sum of its proper divisors (78199).

1161166217 is an equidigital number, since it uses as much as digits as its factorization.

1161166217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78198.

The product of its digits is 3024, while the sum is 32.

The square root of 1161166217 is about 34075.8890859798. The cubic root of 1161166217 is about 1051.0695728557.

Adding to 1161166217 its reverse (7126611611), we get a palindrome (8287777828).

The spelling of 1161166217 in words is "one billion, one hundred sixty-one million, one hundred sixty-six thousand, two hundred seventeen".