999961579 has 2 divisors, whose sum is σ = 999961580. Its totient is φ = 999961578.

The previous prime is 999961577. The next prime is 999961631. The reversal of 999961579 is 975169999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999961579 - 2¹ = 999961577 is a prime.

Together with 999961577, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999961579.

It is not a weakly prime, because it can be changed into another prime (999961577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499980789 + 499980790.

It is an arithmetic number, because the mean of its divisors is an integer number (499980790).

Almost surely, 2^999961579 is an apocalyptic number.

999961579 is a deficient number, since it is larger than the sum of its proper divisors (1).

999961579 is an equidigital number, since it uses as much as digits as its factorization.

999961579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12400290, while the sum is 64.

The square root of 999961579 is about 31622.1691064987. The cubic root of 999961579 is about 999.9871928360.

It can be divided in two parts, 999 and 961579, that added together give a triangular number (962578 = T₁₃₈₇).

The spelling of 999961579 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, five hundred seventy-nine".