199520617 has 2 divisors, whose sum is σ = 199520618. Its totient is φ = 199520616.

The previous prime is 199520611. The next prime is 199520621. The reversal of 199520617 is 716025991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117418896 + 82101721 = 10836^2 + 9061^2 .

It is a cyclic number.

It is not a de Polignac number, because 199520617 - 2²³ = 191132009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199520617.

It is not a weakly prime, because it can be changed into another prime (199520611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99760308 + 99760309.

It is an arithmetic number, because the mean of its divisors is an integer number (99760309).

Almost surely, 2^199520617 is an apocalyptic number.

It is an amenable number.

199520617 is a deficient number, since it is larger than the sum of its proper divisors (1).

199520617 is an equidigital number, since it uses as much as digits as its factorization.

199520617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 40.

The square root of 199520617 is about 14125.1767068593. The cubic root of 199520617 is about 584.3359323668.

The spelling of 199520617 in words is "one hundred ninety-nine million, five hundred twenty thousand, six hundred seventeen".