199192517 has 4 divisors (see below), whose sum is σ = 199538316. Its totient is φ = 198846720.

The previous prime is 199192481. The next prime is 199192529. The reversal of 199192517 is 715291991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 715291991 = 79 ⋅9054329.

It can be written as a sum of positive squares in 2 ways, for example, as 143376676 + 55815841 = 11974^2 + 7471^2 .

It is a cyclic number.

It is not a de Polignac number, because 199192517 - 2¹² = 199188421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199192547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172034 + ... + 173187.

It is an arithmetic number, because the mean of its divisors is an integer number (49884579).

Almost surely, 2^199192517 is an apocalyptic number.

It is an amenable number.

199192517 is a deficient number, since it is larger than the sum of its proper divisors (345799).

199192517 is an equidigital number, since it uses as much as digits as its factorization.

199192517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345798.

The product of its digits is 51030, while the sum is 44.

The square root of 199192517 is about 14113.5579142894. The cubic root of 199192517 is about 584.0154545310.

The spelling of 199192517 in words is "one hundred ninety-nine million, one hundred ninety-two thousand, five hundred seventeen".