199251097 has 2 divisors, whose sum is σ = 199251098. Its totient is φ = 199251096.

The previous prime is 199251089. The next prime is 199251127. The reversal of 199251097 is 790152991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138862656 + 60388441 = 11784^2 + 7771^2 .

It is a cyclic number.

It is not a de Polignac number, because 199251097 - 2³ = 199251089 is a prime.

It is not a weakly prime, because it can be changed into another prime (199251197) 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 as a sum of consecutive naturals, namely, 99625548 + 99625549.

It is an arithmetic number, because the mean of its divisors is an integer number (99625549).

Almost surely, 2^199251097 is an apocalyptic number.

It is an amenable number.

199251097 is a deficient number, since it is larger than the sum of its proper divisors (1).

199251097 is an equidigital number, since it uses as much as digits as its factorization.

199251097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51030, while the sum is 43.

The square root of 199251097 is about 14115.6330711733. The cubic root of 199251097 is about 584.0726994393.

The spelling of 199251097 in words is "one hundred ninety-nine million, two hundred fifty-one thousand, ninety-seven".