999999951111109 has 4 divisors (see below), whose sum is σ = 1076923024273516. Its totient is φ = 923076877948704.

The previous prime is 999999951111089. The next prime is 999999951111137. The reversal of 999999951111109 is 901111159999999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 593829738178884 + 406170212932225 = 24368622^2 + 20153665^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999951111109 - 2¹⁹ = 999999950586821 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 (999999951111199) 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, 38461536581184 + ... + 38461536581209.

It is an arithmetic number, because the mean of its divisors is an integer number (269230756068379).

Almost surely, 2^{999999951111109} is an apocalyptic number.

It is an amenable number.

999999951111109 is a deficient number, since it is larger than the sum of its proper divisors (76923073162407).

999999951111109 is a wasteful number, since it uses less digits than its factorization.

999999951111109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76923073162406.

The product of its (nonzero) digits is 215233605, while the sum is 82.

The spelling of 999999951111109 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred fifty-one million, one hundred eleven thousand, one hundred nine".