199159993 has 8 divisors (see below), whose sum is σ = 200277000. Its totient is φ = 198046848.

The previous prime is 199159973. The next prime is 199159997. The reversal of 199159993 is 399951991.

It can be written as a sum of positive squares in 4 ways, for example, as 106750224 + 92409769 = 10332^2 + 9613^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199159993 - 2⁹ = 199159481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199159997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189333 + ... + 190381.

It is an arithmetic number, because the mean of its divisors is an integer number (25034625).

Almost surely, 2^199159993 is an apocalyptic number.

It is an amenable number.

199159993 is a deficient number, since it is larger than the sum of its proper divisors (1117007).

199159993 is a wasteful number, since it uses less digits than its factorization.

199159993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931.

The product of its digits is 885735, while the sum is 55.

The square root of 199159993 is about 14112.4056418458. The cubic root of 199159993 is about 583.9836669370.

The spelling of 199159993 in words is "one hundred ninety-nine million, one hundred fifty-nine thousand, nine hundred ninety-three".