1155005509 has 8 divisors (see below), whose sum is σ = 1346945600. Its totient is φ = 990004428.

The previous prime is 1155005479. The next prime is 1155005519. The reversal of 1155005509 is 9055005511.

It is not a de Polignac number, because 1155005509 - 2⁵ = 1155005477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155005519) 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 in 7 ways as a sum of consecutive naturals, for example, 1683339 + ... + 1684024.

It is an arithmetic number, because the mean of its divisors is an integer number (168368200).

Almost surely, 2^1155005509 is an apocalyptic number.

It is an amenable number.

1155005509 is a deficient number, since it is larger than the sum of its proper divisors (191940091).

1155005509 is an frugal number, since it uses more digits than its factorization.

1155005509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3367384 (or 3367370 counting only the distinct ones).

The product of its (nonzero) digits is 5625, while the sum is 31.

The square root of 1155005509 is about 33985.3719856058. The cubic root of 1155005509 is about 1049.2074166908.

The spelling of 1155005509 in words is "one billion, one hundred fifty-five million, five thousand, five hundred nine".