19954217 has 2 divisors, whose sum is σ = 19954218. Its totient is φ = 19954216.

The previous prime is 19954201. The next prime is 19954223. The reversal of 19954217 is 71245991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11316496 + 8637721 = 3364^2 + 2939^2 .

It is a cyclic number.

It is not a de Polignac number, because 19954217 - 2⁴ = 19954201 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19954717) 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, 9977108 + 9977109.

It is an arithmetic number, because the mean of its divisors is an integer number (9977109).

Almost surely, 2^19954217 is an apocalyptic number.

It is an amenable number.

19954217 is a deficient number, since it is larger than the sum of its proper divisors (1).

19954217 is an equidigital number, since it uses as much as digits as its factorization.

19954217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 38.

The square root of 19954217 is about 4467.0143272660. The cubic root of 19954217 is about 271.2344797763.

The spelling of 19954217 in words is "nineteen million, nine hundred fifty-four thousand, two hundred seventeen".