189427109 has 2 divisors, whose sum is σ = 189427110. Its totient is φ = 189427108.

The previous prime is 189427099. The next prime is 189427153. The reversal of 189427109 is 901724981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177156100 + 12271009 = 13310^2 + 3503^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189427109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189427409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94713554 + 94713555.

It is an arithmetic number, because the mean of its divisors is an integer number (94713555).

Almost surely, 2^189427109 is an apocalyptic number.

It is an amenable number.

189427109 is a deficient number, since it is larger than the sum of its proper divisors (1).

189427109 is an equidigital number, since it uses as much as digits as its factorization.

189427109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 189427109 is about 13763.2521229541. The cubic root of 189427109 is about 574.3113206755.

The spelling of 189427109 in words is "one hundred eighty-nine million, four hundred twenty-seven thousand, one hundred nine".