19191001000001 has 2 divisors, whose sum is σ = 19191001000002. Its totient is φ = 19191001000000.

The previous prime is 19191000999983. The next prime is 19191001000013. The reversal of 19191001000001 is 10000010019191.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10693397045776 + 8497603954225 = 3270076^2 + 2915065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19191001000001 is a prime.

It is not a weakly prime, because it can be changed into another prime (19191001000201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9595500500000 + 9595500500001.

It is an arithmetic number, because the mean of its divisors is an integer number (9595500500001).

Almost surely, 2^{19191001000001} is an apocalyptic number.

It is an amenable number.

19191001000001 is a deficient number, since it is larger than the sum of its proper divisors (1).

19191001000001 is an equidigital number, since it uses as much as digits as its factorization.

19191001000001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 23.

Adding to 19191001000001 its reverse (10000010019191), we get a palindrome (29191011019192).

The spelling of 19191001000001 in words is "nineteen trillion, one hundred ninety-one billion, one million, one", and thus it is an aban number.