19999899239 has 2 divisors, whose sum is σ = 19999899240. Its totient is φ = 19999899238.

The previous prime is 19999899233. The next prime is 19999899277. The reversal of 19999899239 is 93299899991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19999899239 - 2¹² = 19999895143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19999899239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19999899233) 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, 9999949619 + 9999949620.

It is an arithmetic number, because the mean of its divisors is an integer number (9999949620).

Almost surely, 2^19999899239 is an apocalyptic number.

19999899239 is a deficient number, since it is larger than the sum of its proper divisors (1).

19999899239 is an equidigital number, since it uses as much as digits as its factorization.

19999899239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 229582512, while the sum is 77.

The spelling of 19999899239 in words is "nineteen billion, nine hundred ninety-nine million, eight hundred ninety-nine thousand, two hundred thirty-nine".