999901111 has 8 divisors (see below), whose sum is σ = 1101602448. Its totient is φ = 900000000.

The previous prime is 999901109. The next prime is 999901117. The reversal of 999901111 is 111109999.

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

It is a 8-Lehmer number, since φ(999901111) divides (999901111-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 999901111 - 2¹ = 999901109 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 (999901117) 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 7 ways as a sum of consecutive naturals, for example, 448890 + ... + 451111.

It is an arithmetic number, because the mean of its divisors is an integer number (137700306).

Almost surely, 2^999901111 is an apocalyptic number.

999901111 is a deficient number, since it is larger than the sum of its proper divisors (101701337).

999901111 is a wasteful number, since it uses less digits than its factorization.

999901111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900113.

The product of its (nonzero) digits is 6561, while the sum is 40.

The square root of 999901111 is about 31621.2129906492. The cubic root of 999901111 is about 999.9670359134.

It can be divided in two parts, 999901 and 111, that multiplied together give a palindrome (110989011).

The spelling of 999901111 in words is "nine hundred ninety-nine million, nine hundred one thousand, one hundred eleven".