164891091 has 8 divisors (see below), whose sum is σ = 222638080. Its totient is φ = 108535752.

The previous prime is 164891033. The next prime is 164891093. The reversal of 164891091 is 190198461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 164891091 - 2¹³ = 164882899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164891093) 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 7 ways as a sum of consecutive naturals, for example, 347635 + ... + 348108.

It is an arithmetic number, because the mean of its divisors is an integer number (27829760).

Almost surely, 2^164891091 is an apocalyptic number.

164891091 is a deficient number, since it is larger than the sum of its proper divisors (57746989).

164891091 is an equidigital number, since it uses as much as digits as its factorization.

164891091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695825.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 164891091 is about 12840.9926018202. The cubic root of 164891091 is about 548.3599529661.

The spelling of 164891091 in words is "one hundred sixty-four million, eight hundred ninety-one thousand, ninety-one".