1151228311 has 4 divisors (see below), whose sum is σ = 1151387712. Its totient is φ = 1151068912.

The previous prime is 1151228303. The next prime is 1151228339. The reversal of 1151228311 is 1138221511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1138221511 = 7 ⋅162603073.

It is a cyclic number.

It is not a de Polignac number, because 1151228311 - 2³ = 1151228303 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 (1151229311) 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, 68326 + ... + 83491.

It is an arithmetic number, because the mean of its divisors is an integer number (287846928).

Almost surely, 2^1151228311 is an apocalyptic number.

1151228311 is a deficient number, since it is larger than the sum of its proper divisors (159401).

1151228311 is an equidigital number, since it uses as much as digits as its factorization.

1151228311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159400.

The product of its digits is 480, while the sum is 25.

The square root of 1151228311 is about 33929.7555399387. The cubic root of 1151228311 is about 1048.0624316356.

Adding to 1151228311 its reverse (1138221511), we get a palindrome (2289449822).

The spelling of 1151228311 in words is "one billion, one hundred fifty-one million, two hundred twenty-eight thousand, three hundred eleven".