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220501 = 239587
BaseRepresentation
bin110101110101010101
3102012110201
4311311111
524024001
64420501
71605601
oct656525
9365421
10220501
11140736
12a7731
1379498
145a501
1545501
hex35d55

220501 has 4 divisors (see below), whose sum is σ = 230112. Its totient is φ = 210892.

The previous prime is 220471. The next prime is 220511. The reversal of 220501 is 105022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 105022 = 252511.

It is a cyclic number.

It is not a de Polignac number, because 220501 - 25 = 220469 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4771 + ... + 4816.

It is an arithmetic number, because the mean of its divisors is an integer number (57528).

2220501 is an apocalyptic number.

It is an amenable number.

220501 is a deficient number, since it is larger than the sum of its proper divisors (9611).

220501 is an equidigital number, since it uses as much as digits as its factorization.

220501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9610.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 220501 is about 469.5753400680. The cubic root of 220501 is about 60.4138975082.

Adding to 220501 its reverse (105022), we get a palindrome (325523).

It can be divided in two parts, 2 and 20501, that added together give a triangular number (20503 = T202).

The spelling of 220501 in words is "two hundred twenty thousand, five hundred one".

Divisors: 1 23 9587 220501