189121811 has 2 divisors, whose sum is σ = 189121812. Its totient is φ = 189121810.

The previous prime is 189121781. The next prime is 189121841. The reversal of 189121811 is 118121981.

It is a balanced prime because it is at equal distance from previous prime (189121781) and next prime (189121841).

It is an emirp because it is prime and its reverse (118121981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189121811 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189121841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94560905 + 94560906.

It is an arithmetic number, because the mean of its divisors is an integer number (94560906).

Almost surely, 2^189121811 is an apocalyptic number.

189121811 is a deficient number, since it is larger than the sum of its proper divisors (1).

189121811 is an equidigital number, since it uses as much as digits as its factorization.

189121811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 32.

The square root of 189121811 is about 13752.1565945127. The cubic root of 189121811 is about 574.0026172753.

The spelling of 189121811 in words is "one hundred eighty-nine million, one hundred twenty-one thousand, eight hundred eleven".