19128485381 has 2 divisors, whose sum is σ = 19128485382. Its totient is φ = 19128485380.

The previous prime is 19128485309. The next prime is 19128485393. The reversal of 19128485381 is 18358482191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18012324100 + 1116161281 = 134210^2 + 33409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19128485381 is a prime.

It is a super-2 number, since 2×19128485381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19128485281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9564242690 + 9564242691.

It is an arithmetic number, because the mean of its divisors is an integer number (9564242691).

Almost surely, 2^19128485381 is an apocalyptic number.

It is an amenable number.

19128485381 is a deficient number, since it is larger than the sum of its proper divisors (1).

19128485381 is an equidigital number, since it uses as much as digits as its factorization.

19128485381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 50.

The spelling of 19128485381 in words is "nineteen billion, one hundred twenty-eight million, four hundred eighty-five thousand, three hundred eighty-one".