199738061 has 2 divisors, whose sum is σ = 199738062. Its totient is φ = 199738060.

The previous prime is 199738057. The next prime is 199738067. The reversal of 199738061 is 160837991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199685161 + 52900 = 14131^2 + 230^2 .

It is an emirp because it is prime and its reverse (160837991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199738061 - 2² = 199738057 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199738067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99869030 + 99869031.

It is an arithmetic number, because the mean of its divisors is an integer number (99869031).

Almost surely, 2^199738061 is an apocalyptic number.

It is an amenable number.

199738061 is a deficient number, since it is larger than the sum of its proper divisors (1).

199738061 is an equidigital number, since it uses as much as digits as its factorization.

199738061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 199738061 is about 14132.8716473334. The cubic root of 199738061 is about 584.5481313435.

The spelling of 199738061 in words is "one hundred ninety-nine million, seven hundred thirty-eight thousand, sixty-one".