1155552521 has 2 divisors, whose sum is σ = 1155552522. Its totient is φ = 1155552520.

The previous prime is 1155552511. The next prime is 1155552523. The reversal of 1155552521 is 1252555511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1126273600 + 29278921 = 33560^2 + 5411^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155552521 - 2⁶ = 1155552457 is a prime.

Together with 1155552523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1155552523) 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, 577776260 + 577776261.

It is an arithmetic number, because the mean of its divisors is an integer number (577776261).

Almost surely, 2^1155552521 is an apocalyptic number.

It is an amenable number.

1155552521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155552521 is an equidigital number, since it uses as much as digits as its factorization.

1155552521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12500, while the sum is 32.

The square root of 1155552521 is about 33993.4187895245. The cubic root of 1155552521 is about 1049.3730258480.

The spelling of 1155552521 in words is "one billion, one hundred fifty-five million, five hundred fifty-two thousand, five hundred twenty-one".