199506397 has 2 divisors, whose sum is σ = 199506398. Its totient is φ = 199506396.

The previous prime is 199506361. The next prime is 199506449. The reversal of 199506397 is 793605991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199204996 + 301401 = 14114^2 + 549^2 .

It is a cyclic number.

It is not a de Polignac number, because 199506397 - 2¹⁹ = 198982109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199506397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199506497) 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, 99753198 + 99753199.

It is an arithmetic number, because the mean of its divisors is an integer number (99753199).

Almost surely, 2^199506397 is an apocalyptic number.

It is an amenable number.

199506397 is a deficient number, since it is larger than the sum of its proper divisors (1).

199506397 is an equidigital number, since it uses as much as digits as its factorization.

199506397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 459270, while the sum is 49.

The square root of 199506397 is about 14124.6733413555. The cubic root of 199506397 is about 584.3220500014.

The spelling of 199506397 in words is "one hundred ninety-nine million, five hundred six thousand, three hundred ninety-seven".