99911111 has 4 divisors (see below), whose sum is σ = 100418472. Its totient is φ = 99403752.

The previous prime is 99911093. The next prime is 99911183. The reversal of 99911111 is 11111999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11111999 = 17 ⋅653647.

It is a cyclic number.

It is not a de Polignac number, because 99911111 - 2¹⁰ = 99910087 is a prime.

It is a Duffinian number.

99911111 is a modest number, since divided by 11111 gives 999 as remainder.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99919111) 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, 253385 + ... + 253778.

It is an arithmetic number, because the mean of its divisors is an integer number (25104618).

Almost surely, 2^99911111 is an apocalyptic number.

99911111 is a deficient number, since it is larger than the sum of its proper divisors (507361).

99911111 is a wasteful number, since it uses less digits than its factorization.

99911111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507360.

The product of its digits is 729, while the sum is 32.

The square root of 99911111 is about 9995.5545619040. The cubic root of 99911111 is about 464.0213138619.

The spelling of 99911111 in words is "ninety-nine million, nine hundred eleven thousand, one hundred eleven".