190935509 has 2 divisors, whose sum is σ = 190935510. Its totient is φ = 190935508.

The previous prime is 190935473. The next prime is 190935539. The reversal of 190935509 is 905539091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101103025 + 89832484 = 10055^2 + 9478^2 .

It is a cyclic number.

It is not a de Polignac number, because 190935509 - 2⁸ = 190935253 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190935539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95467754 + 95467755.

It is an arithmetic number, because the mean of its divisors is an integer number (95467755).

Almost surely, 2^190935509 is an apocalyptic number.

It is an amenable number.

190935509 is a deficient number, since it is larger than the sum of its proper divisors (1).

190935509 is an equidigital number, since it uses as much as digits as its factorization.

190935509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54675, while the sum is 41.

The square root of 190935509 is about 13817.9415616075. The cubic root of 190935509 is about 575.8316977499.

The spelling of 190935509 in words is "one hundred ninety million, nine hundred thirty-five thousand, five hundred nine".