19600000991 has 2 divisors, whose sum is σ = 19600000992. Its totient is φ = 19600000990.

The previous prime is 19600000957. The next prime is 19600000999. The reversal of 19600000991 is 19900000691.

It is a strong prime.

It is an emirp because it is prime and its reverse (19900000691) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19600000991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19600000999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9800000495 + 9800000496.

It is an arithmetic number, because the mean of its divisors is an integer number (9800000496).

Almost surely, 2^19600000991 is an apocalyptic number.

19600000991 is a deficient number, since it is larger than the sum of its proper divisors (1).

19600000991 is an equidigital number, since it uses as much as digits as its factorization.

19600000991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 35.

The spelling of 19600000991 in words is "nineteen billion, six hundred million, nine hundred ninety-one", and thus it is an aban number.