999789912113 has 2 divisors, whose sum is σ = 999789912114. Its totient is φ = 999789912112.

The previous prime is 999789912109. The next prime is 999789912137. The reversal of 999789912113 is 311219987999.

999789912113 = 707032² + 707033².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 499895663089 + 499894249024 = 707033^2 + 707032^2 .

It is a cyclic number.

It is not a de Polignac number, because 999789912113 - 2² = 999789912109 is a prime.

It is not a weakly prime, because it can be changed into another prime (999789912713) 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, 499894956056 + 499894956057.

It is an arithmetic number, because the mean of its divisors is an integer number (499894956057).

Almost surely, 2^999789912113 is an apocalyptic number.

999789912113 is the 707033-rd centered square number.

It is an amenable number.

999789912113 is a deficient number, since it is larger than the sum of its proper divisors (1).

999789912113 is an equidigital number, since it uses as much as digits as its factorization.

999789912113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19840464, while the sum is 68.

The spelling of 999789912113 in words is "nine hundred ninety-nine billion, seven hundred eighty-nine million, nine hundred twelve thousand, one hundred thirteen".