919109189 has 2 divisors, whose sum is σ = 919109190. Its totient is φ = 919109188.

The previous prime is 919109183. The next prime is 919109197. The reversal of 919109189 is 981901919.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 607869025 + 311240164 = 24655^2 + 17642^2 .

It is a cyclic number.

It is not a de Polignac number, because 919109189 - 2⁸ = 919108933 is a prime.

It is equal to p_46936289 and since 919109189 and 46936289 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (919109183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459554594 + 459554595.

It is an arithmetic number, because the mean of its divisors is an integer number (459554595).

Almost surely, 2^919109189 is an apocalyptic number.

It is an amenable number.

919109189 is a deficient number, since it is larger than the sum of its proper divisors (1).

919109189 is an equidigital number, since it uses as much as digits as its factorization.

919109189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 47.

The square root of 919109189 is about 30316.8136353410. The cubic root of 919109189 is about 972.2748144035.

The spelling of 919109189 in words is "nine hundred nineteen million, one hundred nine thousand, one hundred eighty-nine".