19900193 has 2 divisors, whose sum is σ = 19900194. Its totient is φ = 19900192.

The previous prime is 19900159. The next prime is 19900253. The reversal of 19900193 is 39100991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19864849 + 35344 = 4457^2 + 188^2 .

It is a cyclic number.

It is not a de Polignac number, because 19900193 - 2¹⁰ = 19899169 is a prime.

It is not a weakly prime, because it can be changed into another prime (19900123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950096 + 9950097.

It is an arithmetic number, because the mean of its divisors is an integer number (9950097).

Almost surely, 2^19900193 is an apocalyptic number.

It is an amenable number.

19900193 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900193 is an equidigital number, since it uses as much as digits as its factorization.

19900193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 19900193 is about 4460.9632367909. The cubic root of 19900193 is about 270.9894786745.

The spelling of 19900193 in words is "nineteen million, nine hundred thousand, one hundred ninety-three".