999979159 has 2 divisors, whose sum is σ = 999979160. Its totient is φ = 999979158.

The previous prime is 999979157. The next prime is 999979237. The reversal of 999979159 is 951979999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999979159 - 2¹ = 999979157 is a prime.

Together with 999979157, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 999979094 and 999979103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999979157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499989579 + 499989580.

It is an arithmetic number, because the mean of its divisors is an integer number (499989580).

Almost surely, 2^999979159 is an apocalyptic number.

999979159 is a deficient number, since it is larger than the sum of its proper divisors (1).

999979159 is an equidigital number, since it uses as much as digits as its factorization.

999979159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18600435, while the sum is 67.

The square root of 999979159 is about 31622.4470748233. The cubic root of 999979159 is about 999.9930529517.

The spelling of 999979159 in words is "nine hundred ninety-nine million, nine hundred seventy-nine thousand, one hundred fifty-nine".