164690843 has 2 divisors, whose sum is σ = 164690844. Its totient is φ = 164690842.

The previous prime is 164690839. The next prime is 164690873. The reversal of 164690843 is 348096461.

It is a weak prime.

It is an emirp because it is prime and its reverse (348096461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164690843 - 2² = 164690839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 164690843.

It is not a weakly prime, because it can be changed into another prime (164690873) 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, 82345421 + 82345422.

It is an arithmetic number, because the mean of its divisors is an integer number (82345422).

Almost surely, 2^164690843 is an apocalyptic number.

164690843 is a deficient number, since it is larger than the sum of its proper divisors (1).

164690843 is an equidigital number, since it uses as much as digits as its factorization.

164690843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 164690843 is about 12833.1930165489. The cubic root of 164690843 is about 548.1378822154.

The spelling of 164690843 in words is "one hundred sixty-four million, six hundred ninety thousand, eight hundred forty-three".