19549380439 has 2 divisors, whose sum is σ = 19549380440. Its totient is φ = 19549380438.

The previous prime is 19549380419. The next prime is 19549380457. The reversal of 19549380439 is 93408394591.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (93408394591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19549380439 - 2²⁵ = 19515826007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19549380439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19549380419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9774690219 + 9774690220.

It is an arithmetic number, because the mean of its divisors is an integer number (9774690220).

Almost surely, 2^19549380439 is an apocalyptic number.

19549380439 is a deficient number, since it is larger than the sum of its proper divisors (1).

19549380439 is an equidigital number, since it uses as much as digits as its factorization.

19549380439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The spelling of 19549380439 in words is "nineteen billion, five hundred forty-nine million, three hundred eighty thousand, four hundred thirty-nine".