164005261 has 8 divisors (see below), whose sum is σ = 189693504. Its totient is φ = 138881760.

The previous prime is 164005229. The next prime is 164005297. The reversal of 164005261 is 162500461.

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

It is a cyclic number.

It is not a de Polignac number, because 164005261 - 2⁵ = 164005229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164015261) 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, 140560 + ... + 141721.

It is an arithmetic number, because the mean of its divisors is an integer number (23711688).

Almost surely, 2^164005261 is an apocalyptic number.

It is an amenable number.

164005261 is a deficient number, since it is larger than the sum of its proper divisors (25688243).

164005261 is an equidigital number, since it uses as much as digits as its factorization.

164005261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282371.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 164005261 is about 12806.4538807587. The cubic root of 164005261 is about 547.3762204975.

The spelling of 164005261 in words is "one hundred sixty-four million, five thousand, two hundred sixty-one".