1155061011 has 16 divisors (see below), whose sum is σ = 1668489984. Its totient is φ = 706546464.

The previous prime is 1155061001. The next prime is 1155061123. The reversal of 1155061011 is 1101605511.

It is a happy number.

It is not a de Polignac number, because 1155061011 - 2⁹ = 1155060499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1155061001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82161 + ... + 95186.

It is an arithmetic number, because the mean of its divisors is an integer number (104280624).

Almost surely, 2^1155061011 is an apocalyptic number.

1155061011 is a deficient number, since it is larger than the sum of its proper divisors (513428973).

1155061011 is a wasteful number, since it uses less digits than its factorization.

1155061011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177530.

The product of its (nonzero) digits is 150, while the sum is 21.

The square root of 1155061011 is about 33986.1885329909. The cubic root of 1155061011 is about 1049.2242224338.

Adding to 1155061011 its reverse (1101605511), we get a palindrome (2256666522).

The spelling of 1155061011 in words is "one billion, one hundred fifty-five million, sixty-one thousand, eleven".