1115665111 has 4 divisors (see below), whose sum is σ = 1217089224. Its totient is φ = 1014241000.

The previous prime is 1115665091. The next prime is 1115665121.

1115665111 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1115665111 - 2²³ = 1107276503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1115665111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115665121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50712040 + ... + 50712061.

It is an arithmetic number, because the mean of its divisors is an integer number (304272306).

Almost surely, 2^1115665111 is an apocalyptic number.

1115665111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1115665111 is a deficient number, since it is larger than the sum of its proper divisors (101424113).

1115665111 is a wasteful number, since it uses less digits than its factorization.

1115665111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101424112.

The product of its digits is 900, while the sum is 28.

The square root of 1115665111 is about 33401.5734809006. The cubic root of 1115665111 is about 1037.1572734710.

It can be divided in two parts, 11156 and 65111, that added together give a palindrome (76267).

The spelling of 1115665111 in words is "one billion, one hundred fifteen million, six hundred sixty-five thousand, one hundred eleven".