199055993 has 4 divisors (see below), whose sum is σ = 202319268. Its totient is φ = 195792720.

The previous prime is 199055981. The next prime is 199056019. The reversal of 199055993 is 399550991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18207289 + 180848704 = 4267^2 + 13448^2 .

It is a cyclic number.

It is not a de Polignac number, because 199055993 - 2⁴ = 199055977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199055933) 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, 1631546 + ... + 1631667.

It is an arithmetic number, because the mean of its divisors is an integer number (50579817).

Almost surely, 2^199055993 is an apocalyptic number.

It is an amenable number.

199055993 is a deficient number, since it is larger than the sum of its proper divisors (3263275).

199055993 is an equidigital number, since it uses as much as digits as its factorization.

199055993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3263274.

The product of its (nonzero) digits is 492075, while the sum is 50.

The square root of 199055993 is about 14108.7204593471. The cubic root of 199055993 is about 583.8819984657.

The spelling of 199055993 in words is "one hundred ninety-nine million, fifty-five thousand, nine hundred ninety-three".