19338239861 has 2 divisors, whose sum is σ = 19338239862. Its totient is φ = 19338239860.

The previous prime is 19338239783. The next prime is 19338239863. The reversal of 19338239861 is 16893283391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12250283761 + 7087956100 = 110681^2 + 84190^2 .

It is an emirp because it is prime and its reverse (16893283391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19338239861 - 2²² = 19334045557 is a prime.

Together with 19338239863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19338239863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9669119930 + 9669119931.

It is an arithmetic number, because the mean of its divisors is an integer number (9669119931).

Almost surely, 2^19338239861 is an apocalyptic number.

It is an amenable number.

19338239861 is a deficient number, since it is larger than the sum of its proper divisors (1).

19338239861 is an equidigital number, since it uses as much as digits as its factorization.

19338239861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 53.

The spelling of 19338239861 in words is "nineteen billion, three hundred thirty-eight million, two hundred thirty-nine thousand, eight hundred sixty-one".