19408920329 has 2 divisors, whose sum is σ = 19408920330. Its totient is φ = 19408920328.

The previous prime is 19408920319. The next prime is 19408920359. The reversal of 19408920329 is 92302980491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12179329600 + 7229590729 = 110360^2 + 85027^2 .

It is an emirp because it is prime and its reverse (92302980491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19408920329 - 2¹⁶ = 19408854793 is a prime.

It is not a weakly prime, because it can be changed into another prime (19408920319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9704460164 + 9704460165.

It is an arithmetic number, because the mean of its divisors is an integer number (9704460165).

Almost surely, 2^19408920329 is an apocalyptic number.

It is an amenable number.

19408920329 is a deficient number, since it is larger than the sum of its proper divisors (1).

19408920329 is an equidigital number, since it uses as much as digits as its factorization.

19408920329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 19408920329 in words is "nineteen billion, four hundred eight million, nine hundred twenty thousand, three hundred twenty-nine".