999951111 has 24 divisors (see below), whose sum is σ = 1496718080. Its totient is φ = 642869136.

The previous prime is 999951109. The next prime is 999951131. The reversal of 999951111 is 111159999.

999951111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 999951111 - 2¹ = 999951109 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999951131) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14220 + ... + 46926.

Almost surely, 2^999951111 is an apocalyptic number.

999951111 is a deficient number, since it is larger than the sum of its proper divisors (496766969).

999951111 is a wasteful number, since it uses less digits than its factorization.

999951111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32835 (or 32832 counting only the distinct ones).

The product of its digits is 32805, while the sum is 45.

The square root of 999951111 is about 31622.0035892731. The cubic root of 999951111 is about 999.9837034011.

The spelling of 999951111 in words is "nine hundred ninety-nine million, nine hundred fifty-one thousand, one hundred eleven".