190918202009 has 2 divisors, whose sum is σ = 190918202010. Its totient is φ = 190918202008.

The previous prime is 190918201997. The next prime is 190918202021. The reversal of 190918202009 is 900202819091.

190918202009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (190918201997) and next prime (190918202021).

It can be written as a sum of positive squares in only one way, i.e., 164128696384 + 26789505625 = 405128^2 + 163675^2 .

It is a cyclic number.

It is not a de Polignac number, because 190918202009 - 2³² = 186623234713 is a prime.

It is not a weakly prime, because it can be changed into another prime (190918202609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95459101004 + 95459101005.

It is an arithmetic number, because the mean of its divisors is an integer number (95459101005).

Almost surely, 2^190918202009 is an apocalyptic number.

It is an amenable number.

190918202009 is a deficient number, since it is larger than the sum of its proper divisors (1).

190918202009 is an equidigital number, since it uses as much as digits as its factorization.

190918202009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 41.

The spelling of 190918202009 in words is "one hundred ninety billion, nine hundred eighteen million, two hundred two thousand, nine".