1131113281 has 2 divisors, whose sum is σ = 1131113282. Its totient is φ = 1131113280.

The previous prime is 1131113267. The next prime is 1131113353. The reversal of 1131113281 is 1823111311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 783104256 + 348009025 = 27984^2 + 18655^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131113281 - 2¹⁹ = 1130588993 is a prime.

It is a super-2 number, since 2×1131113281² = 2558834508909169922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1131113201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565556640 + 565556641.

It is an arithmetic number, because the mean of its divisors is an integer number (565556641).

Almost surely, 2^1131113281 is an apocalyptic number.

It is an amenable number.

1131113281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131113281 is an equidigital number, since it uses as much as digits as its factorization.

1131113281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 22.

The square root of 1131113281 is about 33632.0276076243. The cubic root of 1131113281 is about 1041.9223815880.

Adding to 1131113281 its reverse (1823111311), we get a palindrome (2954224592).

The spelling of 1131113281 in words is "one billion, one hundred thirty-one million, one hundred thirteen thousand, two hundred eighty-one".