199550123 has 2 divisors, whose sum is σ = 199550124. Its totient is φ = 199550122.

The previous prime is 199550111. The next prime is 199550149. The reversal of 199550123 is 321055991.

It is a weak prime.

It is an emirp because it is prime and its reverse (321055991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199550123 - 2⁶ = 199550059 is a prime.

It is not a weakly prime, because it can be changed into another prime (199550023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99775061 + 99775062.

It is an arithmetic number, because the mean of its divisors is an integer number (99775062).

Almost surely, 2^199550123 is an apocalyptic number.

199550123 is a deficient number, since it is larger than the sum of its proper divisors (1).

199550123 is an equidigital number, since it uses as much as digits as its factorization.

199550123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 199550123 is about 14126.2211153585. The cubic root of 199550123 is about 584.3647356829.

The spelling of 199550123 in words is "one hundred ninety-nine million, five hundred fifty thousand, one hundred twenty-three".