199522909 has 2 divisors, whose sum is σ = 199522910. Its totient is φ = 199522908.

The previous prime is 199522901. The next prime is 199522957. The reversal of 199522909 is 909225991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153214884 + 46308025 = 12378^2 + 6805^2 .

It is a cyclic number.

It is not a de Polignac number, because 199522909 - 2³ = 199522901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199522901) 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, 99761454 + 99761455.

It is an arithmetic number, because the mean of its divisors is an integer number (99761455).

Almost surely, 2^199522909 is an apocalyptic number.

It is an amenable number.

199522909 is a deficient number, since it is larger than the sum of its proper divisors (1).

199522909 is an equidigital number, since it uses as much as digits as its factorization.

199522909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 131220, while the sum is 46.

The square root of 199522909 is about 14125.2578383547. The cubic root of 199522909 is about 584.3381698847.

The spelling of 199522909 in words is "one hundred ninety-nine million, five hundred twenty-two thousand, nine hundred nine".