189135811 has 2 divisors, whose sum is σ = 189135812. Its totient is φ = 189135810.

The previous prime is 189135763. The next prime is 189135833. The reversal of 189135811 is 118531981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189135811 - 2¹³ = 189127619 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189135871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94567905 + 94567906.

It is an arithmetic number, because the mean of its divisors is an integer number (94567906).

Almost surely, 2^189135811 is an apocalyptic number.

189135811 is a deficient number, since it is larger than the sum of its proper divisors (1).

189135811 is an equidigital number, since it uses as much as digits as its factorization.

189135811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 37.

The square root of 189135811 is about 13752.6655961672. The cubic root of 189135811 is about 574.0167807014.

The spelling of 189135811 in words is "one hundred eighty-nine million, one hundred thirty-five thousand, eight hundred eleven".