1011115161 has 24 divisors (see below), whose sum is σ = 1672956480. Its totient is φ = 576459936.

The previous prime is 1011115159. The next prime is 1011115181. The reversal of 1011115161 is 1615111101.

It is a happy number.

It is not a de Polignac number, because 1011115161 - 2¹ = 1011115159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1011115151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9795 + ... + 46023.

It is an arithmetic number, because the mean of its divisors is an integer number (69706520).

Almost surely, 2^1011115161 is an apocalyptic number.

It is an amenable number.

1011115161 is a deficient number, since it is larger than the sum of its proper divisors (661841319).

1011115161 is a wasteful number, since it uses less digits than its factorization.

1011115161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36685 (or 36682 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 18.

The square root of 1011115161 is about 31798.0370620578. The cubic root of 1011115161 is about 1003.6914103890.

Adding to 1011115161 its reverse (1615111101), we get a palindrome (2626226262).

The spelling of 1011115161 in words is "one billion, eleven million, one hundred fifteen thousand, one hundred sixty-one".