1155555553 has 2 divisors, whose sum is σ = 1155555554. Its totient is φ = 1155555552.

The previous prime is 1155555529. The next prime is 1155555563. The reversal of 1155555553 is 3555555511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1009459984 + 146095569 = 31772^2 + 12087^2 .

It is an emirp because it is prime and its reverse (3555555511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1155555553 - 2¹³ = 1155547361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155555503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577777776 + 577777777.

It is an arithmetic number, because the mean of its divisors is an integer number (577777777).

Almost surely, 2^1155555553 is an apocalyptic number.

It is an amenable number.

1155555553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155555553 is an equidigital number, since it uses as much as digits as its factorization.

1155555553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 234375, while the sum is 40.

The square root of 1155555553 is about 33993.4633863630. The cubic root of 1155555553 is about 1049.3739436474.

The spelling of 1155555553 in words is "one billion, one hundred fifty-five million, five hundred fifty-five thousand, five hundred fifty-three".