19267938449 has 2 divisors, whose sum is σ = 19267938450. Its totient is φ = 19267938448.

The previous prime is 19267938409. The next prime is 19267938461. The reversal of 19267938449 is 94483976291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19249620049 + 18318400 = 138743^2 + 4280^2 .

It is an emirp because it is prime and its reverse (94483976291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19267938449 - 2¹² = 19267934353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19267938391 and 19267938400.

It is not a weakly prime, because it can be changed into another prime (19267938409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9633969224 + 9633969225.

It is an arithmetic number, because the mean of its divisors is an integer number (9633969225).

Almost surely, 2^19267938449 is an apocalyptic number.

It is an amenable number.

19267938449 is a deficient number, since it is larger than the sum of its proper divisors (1).

19267938449 is an equidigital number, since it uses as much as digits as its factorization.

19267938449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23514624, while the sum is 62.

The spelling of 19267938449 in words is "nineteen billion, two hundred sixty-seven million, nine hundred thirty-eight thousand, four hundred forty-nine".