19172478287 has 2 divisors, whose sum is σ = 19172478288. Its totient is φ = 19172478286.

The previous prime is 19172478251. The next prime is 19172478301. The reversal of 19172478287 is 78287427191.

It is a strong prime.

It is an emirp because it is prime and its reverse (78287427191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19172478287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19172478887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9586239143 + 9586239144.

It is an arithmetic number, because the mean of its divisors is an integer number (9586239144).

Almost surely, 2^19172478287 is an apocalyptic number.

19172478287 is a deficient number, since it is larger than the sum of its proper divisors (1).

19172478287 is an equidigital number, since it uses as much as digits as its factorization.

19172478287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3161088, while the sum is 56.

The spelling of 19172478287 in words is "nineteen billion, one hundred seventy-two million, four hundred seventy-eight thousand, two hundred eighty-seven".