1155232505989 has 2 divisors, whose sum is σ = 1155232505990. Its totient is φ = 1155232505988.

The previous prime is 1155232505927. The next prime is 1155232506073. The reversal of 1155232505989 is 9895052325511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1095423890625 + 59808615364 = 1046625^2 + 244558^2 .

It is an emirp because it is prime and its reverse (9895052325511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1155232505989 - 2²¹ = 1155230408837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155232505909) 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, 577616252994 + 577616252995.

It is an arithmetic number, because the mean of its divisors is an integer number (577616252995).

Almost surely, 2^{1155232505989} is an apocalyptic number.

It is an amenable number.

1155232505989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155232505989 is an equidigital number, since it uses as much as digits as its factorization.

1155232505989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860000, while the sum is 55.

The spelling of 1155232505989 in words is "one trillion, one hundred fifty-five billion, two hundred thirty-two million, five hundred five thousand, nine hundred eighty-nine".