1155233221 has 2 divisors, whose sum is σ = 1155233222. Its totient is φ = 1155233220.

The previous prime is 1155233159. The next prime is 1155233251. The reversal of 1155233221 is 1223325511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855562500 + 299670721 = 29250^2 + 17311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155233221 - 2²¹ = 1153136069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155233251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577616610 + 577616611.

It is an arithmetic number, because the mean of its divisors is an integer number (577616611).

Almost surely, 2^1155233221 is an apocalyptic number.

It is an amenable number.

1155233221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155233221 is an equidigital number, since it uses as much as digits as its factorization.

1155233221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 1155233221 is about 33988.7219677351. The cubic root of 1155233221 is about 1049.2763633807.

Adding to 1155233221 its reverse (1223325511), we get a palindrome (2378558732).

The spelling of 1155233221 in words is "one billion, one hundred fifty-five million, two hundred thirty-three thousand, two hundred twenty-one".