19218831427 has 2 divisors, whose sum is σ = 19218831428. Its totient is φ = 19218831426.

The previous prime is 19218831421. The next prime is 19218831431. The reversal of 19218831427 is 72413881291.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19218831427 - 2³ = 19218831419 is a prime.

It is not a weakly prime, because it can be changed into another prime (19218831421) 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, 9609415713 + 9609415714.

It is an arithmetic number, because the mean of its divisors is an integer number (9609415714).

Almost surely, 2^19218831427 is an apocalyptic number.

19218831427 is a deficient number, since it is larger than the sum of its proper divisors (1).

19218831427 is an equidigital number, since it uses as much as digits as its factorization.

19218831427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 46.

The spelling of 19218831427 in words is "nineteen billion, two hundred eighteen million, eight hundred thirty-one thousand, four hundred twenty-seven".