111111009905 has 8 divisors (see below), whose sum is σ = 152380813632. Its totient is φ = 76190406768.

The previous prime is 111111009901. The next prime is 111111009943. The reversal of 111111009905 is 509900111111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111111009905 - 2² = 111111009901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111111009901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1587300107 + ... + 1587300176.

It is an arithmetic number, because the mean of its divisors is an integer number (19047601704).

Almost surely, 2^111111009905 is an apocalyptic number.

It is an amenable number.

111111009905 is a deficient number, since it is larger than the sum of its proper divisors (41269803727).

111111009905 is an equidigital number, since it uses as much as digits as its factorization.

111111009905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174600295.

The product of its (nonzero) digits is 405, while the sum is 29.

The spelling of 111111009905 in words is "one hundred eleven billion, one hundred eleven million, nine thousand, nine hundred five".