1135523209 has 2 divisors, whose sum is σ = 1135523210. Its totient is φ = 1135523208.

The previous prime is 1135523197. The next prime is 1135523227. The reversal of 1135523209 is 9023255311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1083726400 + 51796809 = 32920^2 + 7197^2 .

It is a cyclic number.

It is not a de Polignac number, because 1135523209 - 2²³ = 1127134601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1135523309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 567761604 + 567761605.

It is an arithmetic number, because the mean of its divisors is an integer number (567761605).

Almost surely, 2^1135523209 is an apocalyptic number.

It is an amenable number.

1135523209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1135523209 is an equidigital number, since it uses as much as digits as its factorization.

1135523209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 1135523209 is about 33697.5252652179. The cubic root of 1135523209 is about 1043.2746906604.

The spelling of 1135523209 in words is "one billion, one hundred thirty-five million, five hundred twenty-three thousand, two hundred nine".