19081257187 has 2 divisors, whose sum is σ = 19081257188. Its totient is φ = 19081257186.

The previous prime is 19081257157. The next prime is 19081257191. The reversal of 19081257187 is 78175218091.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19081257187 - 2¹¹ = 19081255139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19081257187.

It is not a weakly prime, because it can be changed into another prime (19081257137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9540628593 + 9540628594.

It is an arithmetic number, because the mean of its divisors is an integer number (9540628594).

Almost surely, 2^19081257187 is an apocalyptic number.

19081257187 is a deficient number, since it is larger than the sum of its proper divisors (1).

19081257187 is an equidigital number, since it uses as much as digits as its factorization.

19081257187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 49.

The spelling of 19081257187 in words is "nineteen billion, eighty-one million, two hundred fifty-seven thousand, one hundred eighty-seven".