199609601 has 2 divisors, whose sum is σ = 199609602. Its totient is φ = 199609600.

The previous prime is 199609591. The next prime is 199609603. The reversal of 199609601 is 106906991.

199609601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153165376 + 46444225 = 12376^2 + 6815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199609601 is a prime.

It is a super-2 number, since 2×199609601² = 79687985622758402, which contains 22 as substring.

Together with 199609603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199609603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99804800 + 99804801.

It is an arithmetic number, because the mean of its divisors is an integer number (99804801).

Almost surely, 2^199609601 is an apocalyptic number.

It is an amenable number.

199609601 is a deficient number, since it is larger than the sum of its proper divisors (1).

199609601 is an equidigital number, since it uses as much as digits as its factorization.

199609601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 199609601 is about 14128.3261924405. The cubic root of 199609601 is about 584.4227885881.

The spelling of 199609601 in words is "one hundred ninety-nine million, six hundred nine thousand, six hundred one".