19497205884491 has 2 divisors, whose sum is σ = 19497205884492. Its totient is φ = 19497205884490.

The previous prime is 19497205884449. The next prime is 19497205884529. The reversal of 19497205884491 is 19448850279491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19497205884491 - 2¹⁸ = 19497205622347 is a prime.

It is not a weakly prime, because it can be changed into another prime (19497205880491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9748602942245 + 9748602942246.

It is an arithmetic number, because the mean of its divisors is an integer number (9748602942246).

Almost surely, 2^{19497205884491} is an apocalyptic number.

19497205884491 is a deficient number, since it is larger than the sum of its proper divisors (1).

19497205884491 is an equidigital number, since it uses as much as digits as its factorization.

19497205884491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209018880, while the sum is 71.

The spelling of 19497205884491 in words is "nineteen trillion, four hundred ninety-seven billion, two hundred five million, eight hundred eighty-four thousand, four hundred ninety-one".