19793197 has 2 divisors, whose sum is σ = 19793198. Its totient is φ = 19793196.

The previous prime is 19793173. The next prime is 19793203. The reversal of 19793197 is 79139791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10666756 + 9126441 = 3266^2 + 3021^2 .

It is an emirp because it is prime and its reverse (79139791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19793197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19794197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9896598 + 9896599.

It is an arithmetic number, because the mean of its divisors is an integer number (9896599).

Almost surely, 2^19793197 is an apocalyptic number.

It is an amenable number.

19793197 is a deficient number, since it is larger than the sum of its proper divisors (1).

19793197 is an equidigital number, since it uses as much as digits as its factorization.

19793197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107163, while the sum is 46.

The square root of 19793197 is about 4448.9545963069. The cubic root of 19793197 is about 270.5029354736.

The spelling of 19793197 in words is "nineteen million, seven hundred ninety-three thousand, one hundred ninety-seven".