999240144389 has 2 divisors, whose sum is σ = 999240144390. Its totient is φ = 999240144388.

The previous prime is 999240144299. The next prime is 999240144401. The reversal of 999240144389 is 983441042999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 981718327489 + 17521816900 = 990817^2 + 132370^2 .

It is a cyclic number.

It is not a de Polignac number, because 999240144389 - 2¹⁶ = 999240078853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999240143389) 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, 499620072194 + 499620072195.

It is an arithmetic number, because the mean of its divisors is an integer number (499620072195).

Almost surely, 2^999240144389 is an apocalyptic number.

It is an amenable number.

999240144389 is a deficient number, since it is larger than the sum of its proper divisors (1).

999240144389 is an equidigital number, since it uses as much as digits as its factorization.

999240144389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20155392, while the sum is 62.

The spelling of 999240144389 in words is "nine hundred ninety-nine billion, two hundred forty million, one hundred forty-four thousand, three hundred eighty-nine".