1105511999 has 4 divisors (see below), whose sum is σ = 1105685640. Its totient is φ = 1105338360.

The previous prime is 1105511959. The next prime is 1105512041. The reversal of 1105511999 is 9991155011.

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 1105511999 - 2²⁴ = 1088734783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1105511959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76892 + ... + 90129.

It is an arithmetic number, because the mean of its divisors is an integer number (276421410).

Almost surely, 2^1105511999 is an apocalyptic number.

1105511999 is a deficient number, since it is larger than the sum of its proper divisors (173641).

1105511999 is an equidigital number, since it uses as much as digits as its factorization.

1105511999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173640.

The product of its (nonzero) digits is 18225, while the sum is 41.

The square root of 1105511999 is about 33249.2405777937. The cubic root of 1105511999 is about 1034.0014637694.

The spelling of 1105511999 in words is "one billion, one hundred five million, five hundred eleven thousand, nine hundred ninety-nine".