164686091 has 4 divisors (see below), whose sum is σ = 173353800. Its totient is φ = 156018384.

The previous prime is 164686079. The next prime is 164686097. The reversal of 164686091 is 190686461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 164686091 - 2¹⁴ = 164669707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164686097) 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 in 3 ways as a sum of consecutive naturals, for example, 4333826 + ... + 4333863.

It is an arithmetic number, because the mean of its divisors is an integer number (43338450).

Almost surely, 2^164686091 is an apocalyptic number.

164686091 is a deficient number, since it is larger than the sum of its proper divisors (8667709).

164686091 is an equidigital number, since it uses as much as digits as its factorization.

164686091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8667708.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 164686091 is about 12833.0078703319. The cubic root of 164686091 is about 548.1326101630.

The spelling of 164686091 in words is "one hundred sixty-four million, six hundred eighty-six thousand, ninety-one".