1155341321 has 2 divisors, whose sum is σ = 1155341322. Its totient is φ = 1155341320.

The previous prime is 1155341311. The next prime is 1155341347. The reversal of 1155341321 is 1231435511.

It is an a-pointer prime, because the next prime (1155341347) can be obtained adding 1155341321 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1133062921 + 22278400 = 33661^2 + 4720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155341321 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1155341311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577670660 + 577670661.

It is an arithmetic number, because the mean of its divisors is an integer number (577670661).

Almost surely, 2^1155341321 is an apocalyptic number.

It is an amenable number.

1155341321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155341321 is an equidigital number, since it uses as much as digits as its factorization.

1155341321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 1155341321 is about 33990.3121639093. The cubic root of 1155341321 is about 1049.3090907512.

Adding to 1155341321 its reverse (1231435511), we get a palindrome (2386776832).

The spelling of 1155341321 in words is "one billion, one hundred fifty-five million, three hundred forty-one thousand, three hundred twenty-one".