199121573 has 4 divisors (see below), whose sum is σ = 227567520. Its totient is φ = 170675628.

The previous prime is 199121551. The next prime is 199121579. The reversal of 199121573 is 375121991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 375121991 = 107 ⋅3505813.

It is a cyclic number.

It is not a de Polignac number, because 199121573 - 2⁶ = 199121509 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 (199121579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14222963 + ... + 14222976.

It is an arithmetic number, because the mean of its divisors is an integer number (56891880).

Almost surely, 2^199121573 is an apocalyptic number.

It is an amenable number.

199121573 is a deficient number, since it is larger than the sum of its proper divisors (28445947).

199121573 is an equidigital number, since it uses as much as digits as its factorization.

199121573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28445946.

The product of its digits is 17010, while the sum is 38.

The square root of 199121573 is about 14111.0443624843. The cubic root of 199121573 is about 583.9461123809.

The spelling of 199121573 in words is "one hundred ninety-nine million, one hundred twenty-one thousand, five hundred seventy-three".