189166709 has 2 divisors, whose sum is σ = 189166710. Its totient is φ = 189166708.

The previous prime is 189166693. The next prime is 189166721. The reversal of 189166709 is 907661981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155700484 + 33466225 = 12478^2 + 5785^2 .

It is a cyclic number.

It is not a de Polignac number, because 189166709 - 2⁴ = 189166693 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 (189166729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94583354 + 94583355.

It is an arithmetic number, because the mean of its divisors is an integer number (94583355).

Almost surely, 2^189166709 is an apocalyptic number.

It is an amenable number.

189166709 is a deficient number, since it is larger than the sum of its proper divisors (1).

189166709 is an equidigital number, since it uses as much as digits as its factorization.

189166709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 189166709 is about 13753.7888961551. The cubic root of 189166709 is about 574.0480369094.

The spelling of 189166709 in words is "one hundred eighty-nine million, one hundred sixty-six thousand, seven hundred nine".