999999949013861 has 2 divisors, whose sum is σ = 999999949013862. Its totient is φ = 999999949013860.

The previous prime is 999999949013831. The next prime is 999999949013903. The reversal of 999999949013861 is 168310949999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 997564848062500 + 2435100951361 = 31584250^2 + 1560481^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999949013861 - 2¹⁰ = 999999949012837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999999949013831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999974506930 + 499999974506931.

It is an arithmetic number, because the mean of its divisors is an integer number (499999974506931).

Almost surely, 2^{999999949013861} is an apocalyptic number.

It is an amenable number.

999999949013861 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999949013861 is an equidigital number, since it uses as much as digits as its factorization.

999999949013861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24794911296, while the sum is 95.

The spelling of 999999949013861 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred forty-nine million, thirteen thousand, eight hundred sixty-one".