1155241331 has 2 divisors, whose sum is σ = 1155241332. Its totient is φ = 1155241330.

The previous prime is 1155241327. The next prime is 1155241337. The reversal of 1155241331 is 1331425511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1155241331 - 2² = 1155241327 is a prime.

It is a super-2 number, since 2×1155241331² = 2669165065701303122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1155241331.

It is not a weakly prime, because it can be changed into another prime (1155241337) 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, 577620665 + 577620666.

It is an arithmetic number, because the mean of its divisors is an integer number (577620666).

Almost surely, 2^1155241331 is an apocalyptic number.

1155241331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155241331 is an equidigital number, since it uses as much as digits as its factorization.

1155241331 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 1155241331 is about 33988.8412718057. The cubic root of 1155241331 is about 1049.2788187612.

Adding to 1155241331 its reverse (1331425511), we get a palindrome (2486666842).

The spelling of 1155241331 in words is "one billion, one hundred fifty-five million, two hundred forty-one thousand, three hundred thirty-one".