1135320581 has 2 divisors, whose sum is σ = 1135320582. Its totient is φ = 1135320580.

The previous prime is 1135320569. The next prime is 1135320583. The reversal of 1135320581 is 1850235311.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1101576100 + 33744481 = 33190^2 + 5809^2 .

It is a cyclic number.

It is not a de Polignac number, because 1135320581 - 2⁶ = 1135320517 is a prime.

It is a super-2 number, since 2×1135320581² = 2577905643284355122, which contains 22 as substring.

Together with 1135320583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1135320583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 567660290 + 567660291.

It is an arithmetic number, because the mean of its divisors is an integer number (567660291).

Almost surely, 2^1135320581 is an apocalyptic number.

It is an amenable number.

1135320581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1135320581 is an equidigital number, since it uses as much as digits as its factorization.

1135320581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1135320581 is about 33694.5185601457. The cubic root of 1135320581 is about 1043.2126313859.

Adding to 1135320581 its reverse (1850235311), we get a palindrome (2985555892).

The spelling of 1135320581 in words is "one billion, one hundred thirty-five million, three hundred twenty thousand, five hundred eighty-one".