19208117 has 2 divisors, whose sum is σ = 19208118. Its totient is φ = 19208116.

The previous prime is 19208053. The next prime is 19208129. The reversal of 19208117 is 71180291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16924996 + 2283121 = 4114^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 19208117 - 2⁶ = 19208053 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19208117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19205117) 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, 9604058 + 9604059.

It is an arithmetic number, because the mean of its divisors is an integer number (9604059).

Almost surely, 2^19208117 is an apocalyptic number.

It is an amenable number.

19208117 is a deficient number, since it is larger than the sum of its proper divisors (1).

19208117 is an equidigital number, since it uses as much as digits as its factorization.

19208117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 19208117 is about 4382.7065838361. The cubic root of 19208117 is about 267.8109093503.

The spelling of 19208117 in words is "nineteen million, two hundred eight thousand, one hundred seventeen".