190925209 has 2 divisors, whose sum is σ = 190925210. Its totient is φ = 190925208.

The previous prime is 190925179. The next prime is 190925213. The reversal of 190925209 is 902529091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138579984 + 52345225 = 11772^2 + 7235^2 .

It is an emirp because it is prime and its reverse (902529091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 190925209 - 2⁹ = 190924697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (190925909) 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, 95462604 + 95462605.

It is an arithmetic number, because the mean of its divisors is an integer number (95462605).

Almost surely, 2^190925209 is an apocalyptic number.

It is an amenable number.

190925209 is a deficient number, since it is larger than the sum of its proper divisors (1).

190925209 is an equidigital number, since it uses as much as digits as its factorization.

190925209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 190925209 is about 13817.5688527324. The cubic root of 190925209 is about 575.8213431662.

The spelling of 190925209 in words is "one hundred ninety million, nine hundred twenty-five thousand, two hundred nine".