19819023247 has 2 divisors, whose sum is σ = 19819023248. Its totient is φ = 19819023246.

The previous prime is 19819023223. The next prime is 19819023277. The reversal of 19819023247 is 74232091891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19819023247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19819023197 and 19819023206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19819023277) 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, 9909511623 + 9909511624.

It is an arithmetic number, because the mean of its divisors is an integer number (9909511624).

Almost surely, 2^19819023247 is an apocalyptic number.

19819023247 is a deficient number, since it is larger than the sum of its proper divisors (1).

19819023247 is an equidigital number, since it uses as much as digits as its factorization.

19819023247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 19819023247 in words is "nineteen billion, eight hundred nineteen million, twenty-three thousand, two hundred forty-seven".