199845601 has 4 divisors (see below), whose sum is σ = 199963312. Its totient is φ = 199727892.

The previous prime is 199845587. The next prime is 199845619. The reversal of 199845601 is 106548991.

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: 106548991 = 4057 ⋅26263.

It is a cyclic number.

It is not a de Polignac number, because 199845601 - 2²¹ = 197748449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199845671) 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, 56271 + ... + 59716.

It is an arithmetic number, because the mean of its divisors is an integer number (49990828).

Almost surely, 2^199845601 is an apocalyptic number.

It is an amenable number.

199845601 is a deficient number, since it is larger than the sum of its proper divisors (117711).

199845601 is a wasteful number, since it uses less digits than its factorization.

199845601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117710.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 199845601 is about 14136.6757407815. The cubic root of 199845601 is about 584.6530204289.

The spelling of 199845601 in words is "one hundred ninety-nine million, eight hundred forty-five thousand, six hundred one".