19871228711 has 2 divisors, whose sum is σ = 19871228712. Its totient is φ = 19871228710.

The previous prime is 19871228693. The next prime is 19871228743. The reversal of 19871228711 is 11782217891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19871228711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19871228761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9935614355 + 9935614356.

It is an arithmetic number, because the mean of its divisors is an integer number (9935614356).

Almost surely, 2^19871228711 is an apocalyptic number.

19871228711 is a deficient number, since it is larger than the sum of its proper divisors (1).

19871228711 is an equidigital number, since it uses as much as digits as its factorization.

19871228711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 47.

The spelling of 19871228711 in words is "nineteen billion, eight hundred seventy-one million, two hundred twenty-eight thousand, seven hundred eleven".