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164481 = 3109503
BaseRepresentation
bin101000001010000001
322100121220
4220022001
520230411
63305253
71253352
oct501201
9270556
10164481
11102639
127b229
1359b35
1443d29
1533b06
hex28281

164481 has 8 divisors (see below), whose sum is σ = 221760. Its totient is φ = 108432.

The previous prime is 164477. The next prime is 164503. The reversal of 164481 is 184461.

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

It is not a de Polignac number, because 164481 - 22 = 164477 is a prime.

It is a super-2 number, since 2×1644812 = 54107998722, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 164481.

It is not an unprimeable number, because it can be changed into a prime (164431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76 + ... + 578.

It is an arithmetic number, because the mean of its divisors is an integer number (27720).

2164481 is an apocalyptic number.

164481 is the 257-th centered pentagonal number.

It is an amenable number.

164481 is a deficient number, since it is larger than the sum of its proper divisors (57279).

164481 is a wasteful number, since it uses less digits than its factorization.

164481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615.

The product of its digits is 768, while the sum is 24.

The square root of 164481 is about 405.5625722376. The cubic root of 164481 is about 54.7904977575.

The spelling of 164481 in words is "one hundred sixty-four thousand, four hundred eighty-one".

Divisors: 1 3 109 327 503 1509 54827 164481