1999900111 has 16 divisors (see below), whose sum is σ = 2312388000. Its totient is φ = 1709409280.

The previous prime is 1999900109. The next prime is 1999900121. The reversal of 1999900111 is 1110099991.

It is a cyclic number.

It is not a de Polignac number, because 1999900111 - 2¹ = 1999900109 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 (1999900121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200265 + ... + 210013.

It is an arithmetic number, because the mean of its divisors is an integer number (144524250).

Almost surely, 2^1999900111 is an apocalyptic number.

1999900111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1999900111 is a deficient number, since it is larger than the sum of its proper divisors (312487889).

1999900111 is a wasteful number, since it uses less digits than its factorization.

1999900111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10874.

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

The square root of 1999900111 is about 44720.2427430800. The cubic root of 1999900111 is about 1259.9000741700.

The spelling of 1999900111 in words is "one billion, nine hundred ninety-nine million, nine hundred thousand, one hundred eleven".