19411687871 has 2 divisors, whose sum is σ = 19411687872. Its totient is φ = 19411687870.

The previous prime is 19411687853. The next prime is 19411687891. The reversal of 19411687871 is 17878611491.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19411687871 is a prime.

It is a super-2 number, since 2×19411687871² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19411687891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9705843935 + 9705843936.

It is an arithmetic number, because the mean of its divisors is an integer number (9705843936).

Almost surely, 2^19411687871 is an apocalyptic number.

19411687871 is a deficient number, since it is larger than the sum of its proper divisors (1).

19411687871 is an equidigital number, since it uses as much as digits as its factorization.

19411687871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 53.

The spelling of 19411687871 in words is "nineteen billion, four hundred eleven million, six hundred eighty-seven thousand, eight hundred seventy-one".