19091000989 has 2 divisors, whose sum is σ = 19091000990. Its totient is φ = 19091000988.

The previous prime is 19091000941. The next prime is 19091000993. The reversal of 19091000989 is 98900019091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15735695364 + 3355305625 = 125442^2 + 57925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19091000989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19091030989) 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, 9545500494 + 9545500495.

It is an arithmetic number, because the mean of its divisors is an integer number (9545500495).

Almost surely, 2^19091000989 is an apocalyptic number.

It is an amenable number.

19091000989 is a deficient number, since it is larger than the sum of its proper divisors (1).

19091000989 is an equidigital number, since it uses as much as digits as its factorization.

19091000989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 46.

The spelling of 19091000989 in words is "nineteen billion, ninety-one million, nine hundred eighty-nine", and thus it is an aban number.