1153321243 has 2 divisors, whose sum is σ = 1153321244. Its totient is φ = 1153321242.

The previous prime is 1153321207. The next prime is 1153321307. The reversal of 1153321243 is 3421233511.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1153321243 - 2²⁵ = 1119766811 is a prime.

It is not a weakly prime, because it can be changed into another prime (1153321343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 576660621 + 576660622.

It is an arithmetic number, because the mean of its divisors is an integer number (576660622).

Almost surely, 2^1153321243 is an apocalyptic number.

1153321243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1153321243 is an equidigital number, since it uses as much as digits as its factorization.

1153321243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 25.

The square root of 1153321243 is about 33960.5836669513. The cubic root of 1153321243 is about 1048.6971726471.

Adding to 1153321243 its reverse (3421233511), we get a palindrome (4574554754).

The spelling of 1153321243 in words is "one billion, one hundred fifty-three million, three hundred twenty-one thousand, two hundred forty-three".