199002161 has 4 divisors (see below), whose sum is σ = 201728292. Its totient is φ = 196276032.

The previous prime is 199002109. The next prime is 199002163. The reversal of 199002161 is 161200991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161200991 = 7 ⋅23028713.

It can be written as a sum of positive squares in 2 ways, for example, as 173185600 + 25816561 = 13160^2 + 5081^2 .

It is a cyclic number.

It is not a de Polignac number, because 199002161 - 2²² = 194807857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199002163) 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, 1362956 + ... + 1363101.

It is an arithmetic number, because the mean of its divisors is an integer number (50432073).

Almost surely, 2^199002161 is an apocalyptic number.

It is an amenable number.

199002161 is a deficient number, since it is larger than the sum of its proper divisors (2726131).

199002161 is an equidigital number, since it uses as much as digits as its factorization.

199002161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2726130.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 199002161 is about 14106.8125740721. The cubic root of 199002161 is about 583.8293593915.

The spelling of 199002161 in words is "one hundred ninety-nine million, two thousand, one hundred sixty-one".