199131329 has 2 divisors, whose sum is σ = 199131330. Its totient is φ = 199131328.

The previous prime is 199131307. The next prime is 199131367. The reversal of 199131329 is 923131991.

It is an a-pointer prime, because the next prime (199131367) can be obtained adding 199131329 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132871729 + 66259600 = 11527^2 + 8140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199131329 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 199131292 and 199131301.

It is not a weakly prime, because it can be changed into another prime (199131929) 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, 99565664 + 99565665.

It is an arithmetic number, because the mean of its divisors is an integer number (99565665).

Almost surely, 2^199131329 is an apocalyptic number.

It is an amenable number.

199131329 is a deficient number, since it is larger than the sum of its proper divisors (1).

199131329 is an equidigital number, since it uses as much as digits as its factorization.

199131329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13122, while the sum is 38.

The square root of 199131329 is about 14111.3900449247. The cubic root of 199131329 is about 583.9556490761.

The spelling of 199131329 in words is "one hundred ninety-nine million, one hundred thirty-one thousand, three hundred twenty-nine".