189966811 has 2 divisors, whose sum is σ = 189966812. Its totient is φ = 189966810.

The previous prime is 189966761. The next prime is 189966827. The reversal of 189966811 is 118669981.

It is a happy number.

It is a strong prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 118996681 and 186699811.

It is a cyclic number.

It is not a de Polignac number, because 189966811 - 2¹³ = 189958619 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189966841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94983405 + 94983406.

It is an arithmetic number, because the mean of its divisors is an integer number (94983406).

Almost surely, 2^189966811 is an apocalyptic number.

189966811 is a deficient number, since it is larger than the sum of its proper divisors (1).

189966811 is an equidigital number, since it uses as much as digits as its factorization.

189966811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 49.

The square root of 189966811 is about 13782.8448079488. The cubic root of 189966811 is about 574.8562322356.

The spelling of 189966811 in words is "one hundred eighty-nine million, nine hundred sixty-six thousand, eight hundred eleven".