999912113 has 2 divisors, whose sum is σ = 999912114. Its totient is φ = 999912112.

The previous prime is 999912101. The next prime is 999912131. The reversal of 999912113 is 311219999.

Together with next prime (999912131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 553519729 + 446392384 = 23527^2 + 21128^2 .

It is a cyclic number.

It is not a de Polignac number, because 999912113 - 2¹⁰ = 999911089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999912413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499956056 + 499956057.

It is an arithmetic number, because the mean of its divisors is an integer number (499956057).

Almost surely, 2^999912113 is an apocalyptic number.

It is an amenable number.

999912113 is a deficient number, since it is larger than the sum of its proper divisors (1).

999912113 is an equidigital number, since it uses as much as digits as its factorization.

999912113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39366, while the sum is 44.

The square root of 999912113 is about 31621.3869556666. The cubic root of 999912113 is about 999.9707034751.

The spelling of 999912113 in words is "nine hundred ninety-nine million, nine hundred twelve thousand, one hundred thirteen".