1161366211 has 4 divisors (see below), whose sum is σ = 1162930032. Its totient is φ = 1159802392.

The previous prime is 1161366191. The next prime is 1161366223. The reversal of 1161366211 is 1126631611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1161366211 - 2¹⁵ = 1161333443 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1161366211.

It is not an unprimeable number, because it can be changed into a prime (1161366511) 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 3 ways as a sum of consecutive naturals, for example, 780796 + ... + 782281.

It is an arithmetic number, because the mean of its divisors is an integer number (290732508).

Almost surely, 2^1161366211 is an apocalyptic number.

1161366211 is a deficient number, since it is larger than the sum of its proper divisors (1563821).

1161366211 is an equidigital number, since it uses as much as digits as its factorization.

1161366211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563820.

The product of its digits is 1296, while the sum is 28.

The square root of 1161366211 is about 34078.8234978850. The cubic root of 1161366211 is about 1051.1299132095.

Adding to 1161366211 its reverse (1126631611), we get a palindrome (2287997822).

The spelling of 1161366211 in words is "one billion, one hundred sixty-one million, three hundred sixty-six thousand, two hundred eleven".