188890811 has 2 divisors, whose sum is σ = 188890812. Its totient is φ = 188890810.

The previous prime is 188890771. The next prime is 188890829. The reversal of 188890811 is 118098881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188890811 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 (188890411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94445405 + 94445406.

It is an arithmetic number, because the mean of its divisors is an integer number (94445406).

Almost surely, 2^188890811 is an apocalyptic number.

188890811 is a deficient number, since it is larger than the sum of its proper divisors (1).

188890811 is an equidigital number, since it uses as much as digits as its factorization.

188890811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 44.

The square root of 188890811 is about 13743.7553456106. The cubic root of 188890811 is about 573.7688197636.

The spelling of 188890811 in words is "one hundred eighty-eight million, eight hundred ninety thousand, eight hundred eleven".