19923084749 has 2 divisors, whose sum is σ = 19923084750. Its totient is φ = 19923084748.

The previous prime is 19923084739. The next prime is 19923084751. The reversal of 19923084749 is 94748032991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18470712649 + 1452372100 = 135907^2 + 38110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19923084749 is a prime.

Together with 19923084751, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19923084694 and 19923084703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19923084739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9961542374 + 9961542375.

It is an arithmetic number, because the mean of its divisors is an integer number (9961542375).

Almost surely, 2^19923084749 is an apocalyptic number.

It is an amenable number.

19923084749 is a deficient number, since it is larger than the sum of its proper divisors (1).

19923084749 is an equidigital number, since it uses as much as digits as its factorization.

19923084749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 19923084749 in words is "nineteen billion, nine hundred twenty-three million, eighty-four thousand, seven hundred forty-nine".