1161330311 has 4 divisors (see below), whose sum is σ = 1161439224. Its totient is φ = 1161221400.

The previous prime is 1161330301. The next prime is 1161330319. The reversal of 1161330311 is 1130331611.

It is a happy number.

It is a semiprime because it is the product of two primes, 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 1161330311 - 2¹⁴ = 1161313927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161330319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36485 + ... + 60446.

It is an arithmetic number, because the mean of its divisors is an integer number (290359806).

Almost surely, 2^1161330311 is an apocalyptic number.

1161330311 is a deficient number, since it is larger than the sum of its proper divisors (108913).

1161330311 is an equidigital number, since it uses as much as digits as its factorization.

1161330311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108912.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 1161330311 is about 34078.2967737532. The cubic root of 1161330311 is about 1051.1190823012.

Adding to 1161330311 its reverse (1130331611), we get a palindrome (2291661922).

The spelling of 1161330311 in words is "one billion, one hundred sixty-one million, three hundred thirty thousand, three hundred eleven".