19390813459 has 2 divisors, whose sum is σ = 19390813460. Its totient is φ = 19390813458.

The previous prime is 19390813457. The next prime is 19390813531. The reversal of 19390813459 is 95431809391.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (95431809391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19390813459 - 2¹ = 19390813457 is a prime.

Together with 19390813457, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19390813457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9695406729 + 9695406730.

It is an arithmetic number, because the mean of its divisors is an integer number (9695406730).

Almost surely, 2^19390813459 is an apocalyptic number.

19390813459 is a deficient number, since it is larger than the sum of its proper divisors (1).

19390813459 is an equidigital number, since it uses as much as digits as its factorization.

19390813459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1049760, while the sum is 52.

The spelling of 19390813459 in words is "nineteen billion, three hundred ninety million, eight hundred thirteen thousand, four hundred fifty-nine".