199001123 has 4 divisors (see below), whose sum is σ = 199096128. Its totient is φ = 198906120.

The previous prime is 199001113. The next prime is 199001147. The reversal of 199001123 is 321100991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321100991 = 617 ⋅520423.

It is a cyclic number.

It is not a de Polignac number, because 199001123 - 2¹² = 198997027 is a prime.

It is a super-2 number, since 2×199001123² = 79202893910522258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199001092 and 199001101.

It is not an unprimeable number, because it can be changed into a prime (199001113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44288 + ... + 48573.

It is an arithmetic number, because the mean of its divisors is an integer number (49774032).

Almost surely, 2^199001123 is an apocalyptic number.

199001123 is a deficient number, since it is larger than the sum of its proper divisors (95005).

199001123 is an equidigital number, since it uses as much as digits as its factorization.

199001123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95004.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 199001123 is about 14106.7757832894. The cubic root of 199001123 is about 583.8283443004.

The spelling of 199001123 in words is "one hundred ninety-nine million, one thousand, one hundred twenty-three".