164261 has 4 divisors (see below), whose sum is σ = 165132. Its totient is φ = 163392.

The previous prime is 164251. The next prime is 164267. The reversal of 164261 is 162461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 162461 = 13 ⋅12497.

It can be written as a sum of positive squares in 2 ways, for example, as 62500 + 101761 = 250^2 + 319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164261 is a prime.

It is a super-2 number, since 2×164261² = 53963352242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20 + ... + 573.

It is an arithmetic number, because the mean of its divisors is an integer number (41283).

2¹⁶⁴²⁶¹ is an apocalyptic number.

It is an amenable number.

164261 is a deficient number, since it is larger than the sum of its proper divisors (871).

164261 is an equidigital number, since it uses as much as digits as its factorization.

164261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870.

The product of its digits is 288, while the sum is 20.

The square root of 164261 is about 405.2912532982. The cubic root of 164261 is about 54.7660586881.

The spelling of 164261 in words is "one hundred sixty-four thousand, two hundred sixty-one".